diff --git a/.github/workflows/integrate.yml b/.github/workflows/integrate.yml
index 80b27b39d6..106628de7b 100644
--- a/.github/workflows/integrate.yml
+++ b/.github/workflows/integrate.yml
@@ -14,6 +14,8 @@ jobs:
         os: [ubuntu-latest, windows-latest]
         node: [14, 16]
     runs-on: ${{ matrix.os }}
+    env:
+      NODE_OPTIONS: "--max-old-space-size=4096"
     steps:
       - uses: actions/checkout@v2.3.4
       - uses: actions/setup-node@v2.2.0
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 9ee9022705..749219a4d1 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -23,7 +23,7 @@ jobs:
       - run: >
           yarn workspaces foreach
           --no-private
-          --topological-dev
+          --topological
           npm publish --tolerate-republish
       - uses: actions/create-release@v1.1.4
         env:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2fe230a8e..a15d965b84 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,30 +21,12 @@ Items that are related, such as breaking changes, new features, or changes to ex
 
 ## [Unreleased]
 
-## [0.20.0](../../compare/v0.19.0...v0.20.0) (2021-07-09)
-
 In addition to the changes listed below, this release adjusts the compile target from `es2018` to `es2020`.
 
-### Added
-
-- [@siteimprove/alfa-rules](packages/alfa-rules): Implementations of SIA-R54, SIA-R55, and SIA-R78 are now available. ([#834](../../pull/834), [#835](../../pull/835), [#854](../../pull/854))
-
-- [@siteimprove/alfa-scraper](packages/alfa-scraper): The `Scraper#scrape()` methods now accepts an `archive` option for storing an archive of the page scraped. ([#840](../../pull/840))
-
-- [@siteimprove/alfa-cli](packages/alfa-cli): Two new flags, `--archive` and `--archive-format`, are now available in the `alfa scrape` command for storing an archive of the page scraped. ([#840](../../pull/840))
-
-- [@siteimprove/alfa-hash](packages/alfa-hash): `Hash#writeBigInt()`, `Hash#writeBigInt64()`, `Hash#writeBigUint64()`, `Hash#writeUndefined()`, `Hash#writeNull()`,`Hash#writeObject()`, and `Hash#writeSymbol()` are now available. ([#853](../../pull/853))
-
 ### Fixed
 
-- [@siteimprove/alfa-aria](packages/alfa-aria): A bug in how names were computed for subtrees and implicitly referenced `<label>` elements has been fixed. ([#808](../../issues/808), [#859](../../pull/859))
-
 - [@siteimprove/alfa-rules](packages/alfa-rules): The contrast ratios output in messages from SIA-R66 and SIA-R69 are now correctly listed as `<bright>:<dark>` rather than `<dark>:<bright>`.
 
-- [@siteimprove/alfa-rules](packages/alfa-rules): SIA-R56 is now correctly exported and available for audits. ([#850](../../pull/850))
-
-- [@siteimprove/alfa-rules](packages/alfa-rules): `isClipped()` now considers elements with a height or width of 0 as clipping if overflow causes scrolling. It now also checks if the ancestors of an element might cause it to clip. ([#731](../../issues/731), [#774](../../issues/774), [#827](../../pull/827), [#848](../../pull/848))
-
 ## [0.19.0](../../compare/v0.18.0...v0.19.0) (2021-06-15)
 
 ### Breaking
diff --git a/docs/api.md b/docs/api.md
index a05c805ae1..c166a8e90e 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -395,9 +395,7 @@ In Alfa, JSON serialization is often used as a means of asserting the structure
 
 We've already seen quite a bit about the `@siteimprove/alfa-map` package and its `Map<K, V>` class. The `Map<K, V>` class is, however, just one out of several collections used throughout Alfa. In this section, we'll provide an overview of the most common collections and their intended use. As with any data structures, they each have their own strengths and weaknesses to be mindful of when choosing a collection for a given task.
 
-#### `Collection.Indexed<T>`
-
-##### `List<T>`
+#### `List<T>`
 
 The `List<T>` class provides an implementation of a [persistent][] [vector trie][] for storing a list of values of type `T`. It provides effectively constant time `#append()`, `#set()`, and `#get()`.
 
@@ -415,67 +413,63 @@ For values, `List<T>` uses an implementation of `Equatable`, when available. Tha
 
 - You're only interested in a few values of the list, which might be better served by the `Sequence<T>` class.
 
-##### `Sequence<T>`
+#### `Map<K, V>`
 
-The `Sequence<T>` class provides an implementation of a [persistent][] [lazy][] list for storing a possibly infinite sequence of values of type `T`. By virtue of being lazy, it provides mostly constant time operations as no computations are actually performed until the corresponding values are requested.
+The `Map<K, V>` class provides an implementation of a [persistent][] [hash trie][] for associating unique keys of type `K` with values of type `V`. It provides effectively constant time `#set()`, `#has()`, `#get()`, and `#delete()`.
 
-**Do use when:**
+For keys, `Map<K, V>` uses implementations of `Equatable` and `Hashable`, when available. That is, two keys `a` and `b` are considered the same key if `a.hash().equals(b.hash())` and `a.equals(b)`.
 
-- You're performing sequence operations on an arbitrary and possible infinite `Iterable<T>`. This includes generator functions, which can be beneficial to wrap in a `Sequence<T>`.
+For values, `Map<K, V>` uses an implementation of `Equatable`, when available. That is, no modifications are made when updating the value of a key with the current value `a` and the new value `b` if `a.equals(b)`.
 
-- You're working with a sequence of values that don't all need to be determined at once. Using `Sequence<T>`, such sequences can be constructed in constant time and only the needed values yielded as necessary.
+**Do use when:**
 
-- You're performing sequence operations where eager evaluation would lead to suboptimal performance, such as `#map()` followed by `#find()`. With eager evaluation, `#map()` will be applied to _every_ value of the sequence, even those _after_ the value returned by `#find()`. With lazy evaluation, `#map()` will only be applied _up to and including_ the value returned by `#find()`.
+- Your keys have custom equivalence and hashing constraints.
 
 **Don't use when:**
 
-- You're often modifying the sequence which for each modification, with the exception of prepends, is done in time proportional to the number of values yielded by the sequence.
+- You're working with performance critical code, which may be better served by the builtin `Map<K, V>` or `WeakMap<K, V>` class.
 
-##### `Slice<T>`
+#### `Set<T>`
 
-The `Slice<T>` class provides an implementation of a [persistent][] [copy-on-write][] array for storing values of type `T`. It provides constant time `#get()`, `#has()`, and `#slice()`.
+The `Set<T>` class provides an implementation of a [persistent][] [hash trie][] for storing a set of unique values of type `K`. It provides effectively constant time `#add()`, `#has()`, and `#delete()`.
+
+For values, `Set<T>` uses implementations of `Equatable` and `Hashable`, when available. That is, two values `a` and `b` are considered the same value if `a.hash().equals(b.hash())` and `a.equals(b)`.
 
 **Do use when:**
 
-- You're working with increasingly smaller portions of a backing array, such as when parsing a list of tokens.
+- Your values have custom equivalence and hashing constraints.
 
 **Don't use when:**
 
-- You're working with performance critical code, which may be better served by manually tracking a pointer into the backing array.
-
-#### `Collection.Keyed<K, V>`
-
-##### `Map<K, V>`
-
-The `Map<K, V>` class provides an implementation of a [persistent][] [hash trie][] for associating unique keys of type `K` with values of type `V`. It provides effectively constant time `#set()`, `#has()`, `#get()`, and `#delete()`.
+- You're working with performance critical code, which may be better served by the builtin `Set<T>` or `WeakSet<T>` class.
 
-For keys, `Map<K, V>` uses implementations of `Equatable` and `Hashable`, when available. That is, two keys `a` and `b` are considered the same key if `a.hash().equals(b.hash())` and `a.equals(b)`.
+#### `Sequence<T>`
 
-For values, `Map<K, V>` uses an implementation of `Equatable`, when available. That is, no modifications are made when updating the value of a key with the current value `a` and the new value `b` if `a.equals(b)`.
+The `Sequence<T>` class provides an implementation of a [persistent][] [lazy][] list for storing a possibly infinite sequence of values of type `T`. By virtue of being lazy, it provides mostly constant time operations as no computations are actually performed until the corresponding values are requested.
 
 **Do use when:**
 
-- Your keys have custom equivalence and hashing constraints.
+- You're performing sequence operations on an arbitrary and possible infinite `Iterable<T>`. This includes generator functions, which can be beneficial to wrap in a `Sequence<T>`.
 
-**Don't use when:**
+- You're working with a sequence of values that don't all need to be determined at once. Using `Sequence<T>`, such sequences can be constructed in constant time and only the needed values yielded as necessary.
 
-- You're working with performance critical code, which may be better served by the builtin `Map<K, V>` or `WeakMap<K, V>` class.
+- You're performing sequence operations where eager evaluation would lead to suboptimal performance, such as `#map()` followed by `#find()`. With eager evaluation, `#map()` will be applied to _every_ value of the sequence, even those _after_ the value returned by `#find()`. With lazy evaluation, `#map()` will only be applied _up to and including_ the value returned by `#find()`.
 
-#### `Collection.Unkeyed<T>`
+**Don't use when:**
 
-##### `Set<T>`
+- You're often modifying the sequence which for each modification, with the exception of prepends, is done in time proportional to the number of values yielded by the sequence.
 
-The `Set<T>` class provides an implementation of a [persistent][] [hash trie][] for storing a set of unique values of type `K`. It provides effectively constant time `#add()`, `#has()`, and `#delete()`.
+#### `Slice<T>`
 
-For values, `Set<T>` uses implementations of `Equatable` and `Hashable`, when available. That is, two values `a` and `b` are considered the same value if `a.hash().equals(b.hash())` and `a.equals(b)`.
+The `Slice<T>` class provides an implementation of a [persistent][] [copy-on-write][] array for storing values of type `T`. It provides constant time `#get()`, `#has()`, and `#slice()`.
 
 **Do use when:**
 
-- Your values have custom equivalence and hashing constraints.
+- You're working with increasingly smaller portions of a backing array, such as when parsing a list of tokens.
 
 **Don't use when:**
 
-- You're working with performance critical code, which may be better served by the builtin `Set<T>` or `WeakSet<T>` class.
+- You're working with performance critical code, which may be better served by manually tracking a pointer into the backing array.
 
 [abstract relational comparison]: https://tc39.es/ecma262/#sec-abstract-relational-comparison
 [copy-on-write]: https://en.wikipedia.org/wiki/Copy-on-write
diff --git a/docs/releasing.md b/docs/releasing.md
index d9d41b7c75..4533f52d0d 100644
--- a/docs/releasing.md
+++ b/docs/releasing.md
@@ -7,7 +7,7 @@ Alfa uses the currently experimental [Yarn release workflow](https://yarnpkg.com
 ```console
 $ yarn workspaces foreach \
     --no-private \
-    --topological-dev \
+    --topological \
     version --deferred <patch | minor | major>
 ```
 
diff --git a/docs/review/api/alfa-act.api.md b/docs/review/api/alfa-act.api.md
index f1d7a52479..bacfec9754 100644
--- a/docs/review/api/alfa-act.api.md
+++ b/docs/review/api/alfa-act.api.md
@@ -4,7 +4,6 @@
 
 ```ts
 
-import { Applicative } from '@siteimprove/alfa-applicative';
 import * as earl from '@siteimprove/alfa-earl';
 import { Equatable } from '@siteimprove/alfa-equatable';
 import { Functor } from '@siteimprove/alfa-functor';
@@ -28,7 +27,7 @@ export class Audit<I, T = unknown, Q = never> {
     evaluate(performance?: Performance<Audit.Event<I, T, Q>>): Future<Iterable_2<Outcome<I, T, Q>>>;
     // (undocumented)
     static of<I, T = unknown, Q = never>(input: I, rules: Iterable_2<Rule<I, T, Q>>, oracle?: Oracle<I, T, Q>): Audit<I, T, Q>;
-}
+    }
 
 // @public (undocumented)
 export namespace Audit {
@@ -73,7 +72,7 @@ export class Cache {
     static empty(): Cache;
     // (undocumented)
     get<I, T, Q>(rule: Rule<I, T, Q>, ifMissing: Thunk<Future<Iterable<Outcome<I, T, Q>>>>): Future<Iterable<Outcome<I, T, Q>>>;
-}
+    }
 
 // @public (undocumented)
 export class Diagnostic implements Equatable, Serializable<Diagnostic.JSON> {
@@ -383,17 +382,13 @@ export namespace Outcome {
 }
 
 // @public (undocumented)
-export class Question<Q, S, A, T = A> implements Functor<T>, Applicative<T>, Monad<T>, Serializable<Question.JSON<Q, S>> {
+export class Question<Q, S, A, T = A> implements Functor<T>, Monad<T>, Serializable<Question.JSON<Q, S>> {
     protected constructor(uri: string, type: Q, subject: S, message: string, quester: Mapper<A, T>);
     // (undocumented)
     answer(answer: A): T;
     // (undocumented)
-    apply<U>(mapper: Question<Q, S, A, Mapper<T, U>>): Question<Q, S, A, U>;
-    // (undocumented)
     flatMap<U>(mapper: Mapper<T, Question<Q, S, A, U>>): Question<Q, S, A, U>;
     // (undocumented)
-    flatten<Q, S, A, T>(this: Question<Q, S, A, Question<Q, S, A, T>>): Question<Q, S, A, T>;
-    // (undocumented)
     map<U>(mapper: Mapper<T, U>): Question<Q, S, A, U>;
     // (undocumented)
     get message(): string;
@@ -407,7 +402,7 @@ export class Question<Q, S, A, T = A> implements Functor<T>, Applicative<T>, Mon
     get type(): Q;
     // (undocumented)
     get uri(): string;
-}
+    }
 
 // @public (undocumented)
 export namespace Question {
@@ -644,4 +639,5 @@ export namespace Tag {
     }
 }
 
+
 ```
diff --git a/docs/review/api/alfa-applicative.api.md b/docs/review/api/alfa-applicative.api.md
index 4b9140e70d..2de3416243 100644
--- a/docs/review/api/alfa-applicative.api.md
+++ b/docs/review/api/alfa-applicative.api.md
@@ -4,15 +4,13 @@
 
 ```ts
 
-import { Functor } from '@siteimprove/alfa-functor';
 import { Mapper } from '@siteimprove/alfa-mapper';
 
 // @public (undocumented)
-export interface Applicative<T> extends Functor<T> {
+export interface Applicative<T> {
     // (undocumented)
     apply<U>(mapper: Applicative<Mapper<T, U>>): Applicative<U>;
-    // (undocumented)
-    map<U>(mapper: Mapper<T, U>): Applicative<U>;
 }
 
+
 ```
diff --git a/docs/review/api/alfa-array.api.md b/docs/review/api/alfa-array.api.md
index b646bd0fd7..4b233d181a 100644
--- a/docs/review/api/alfa-array.api.md
+++ b/docs/review/api/alfa-array.api.md
@@ -28,7 +28,7 @@ namespace Array_2 {
     // (undocumented)
     function append<T>(array: Array_2<T>, value: T): Array_2<T>;
     // (undocumented)
-    function apply<T, U>(array: ReadonlyArray<T>, mapper: ReadonlyArray<Mapper<T, U>>): Array_2<U>;
+    function apply<T, U>(iterable: ReadonlyArray<T>, mapper: ReadonlyArray<Mapper<T, U>>): Array_2<U>;
     // (undocumented)
     function clone<T extends Clone<T>>(array: ReadonlyArray<T>): Array_2<T>;
     // (undocumented)
@@ -36,9 +36,9 @@ namespace Array_2 {
     // (undocumented)
     function collectFirst<T, U>(array: ReadonlyArray<T>, mapper: Mapper<T, Option<U>, [index: number]>): Option<U>;
     // (undocumented)
-    function compare<T extends Comparable<U>, U = T>(a: ReadonlyArray<T>, b: Iterable_2<U>): Comparison;
+    function compare<T extends Comparable<T>>(a: ReadonlyArray<T>, b: Iterable_2<T>): Comparison;
     // (undocumented)
-    function compareWith<T, U = T>(a: ReadonlyArray<T>, b: Iterable_2<U>, comparer: Comparer<T, U, [index: number]>): Comparison;
+    function compareWith<T>(a: ReadonlyArray<T>, b: Iterable_2<T>, comparer: Comparer<T>): Comparison;
     // (undocumented)
     function concat<T>(array: ReadonlyArray<T>, ...iterables: Array_2<Iterable_2<T>>): Array_2<T>;
     // (undocumented)
@@ -134,6 +134,8 @@ namespace Array_2 {
     // (undocumented)
     function zip<T, U = T>(array: ReadonlyArray<T>, iterable: Iterable_2<U>): Array_2<[T, U]>;
 }
+
 export { Array_2 as Array }
 
+
 ```
diff --git a/docs/review/api/alfa-branched.api.md b/docs/review/api/alfa-branched.api.md
index 01f393fc04..073f4d9118 100644
--- a/docs/review/api/alfa-branched.api.md
+++ b/docs/review/api/alfa-branched.api.md
@@ -48,8 +48,6 @@ export class Branched<T, B = never> implements Collection<T>, Iterable_2<[T, Ite
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, Branched<U, B>, [Iterable_2<B>]>): Branched<U, B>;
     // (undocumented)
-    flatten<T, B>(this: Branched<Branched<T, B>, B>): Branched<T, B>;
-    // (undocumented)
     forEach(callback: Callback<T, void, [Iterable_2<B>]>): void;
     // (undocumented)
     hash(hash: Hash): void;
@@ -77,7 +75,7 @@ export class Branched<T, B = never> implements Collection<T>, Iterable_2<[T, Ite
     toArray(): Array<[T, Array<B>]>;
     // (undocumented)
     toJSON(): Branched.JSON<T, B>;
-}
+    }
 
 // @public (undocumented)
 export namespace Branched {
@@ -87,8 +85,8 @@ export namespace Branched {
     export function isBranched<T, B = never>(value: unknown): value is Branched<T, B>;
     // (undocumented)
     export type JSON<T, B = never> = Array<[
-    Serializable.ToJSON<T>,
-    Array<Serializable.ToJSON<B>>
+        Serializable.ToJSON<T>,
+        Array<Serializable.ToJSON<B>>
     ]>;
     // (undocumented)
     export function sequence<T, B>(values: Iterable_2<Branched<T, B>>): Branched<Iterable_2<T>, B>;
@@ -96,6 +94,7 @@ export namespace Branched {
     export function traverse<T, U, B>(values: Iterable_2<T>, mapper: Mapper<T, Branched<U, B>, [index: number]>): Branched<Iterable_2<U>, B>;
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-collection.api.md b/docs/review/api/alfa-collection.api.md
index 788455631b..1e34d647b5 100644
--- a/docs/review/api/alfa-collection.api.md
+++ b/docs/review/api/alfa-collection.api.md
@@ -23,7 +23,7 @@ import { Refinement } from '@siteimprove/alfa-refinement';
 import { Serializable } from '@siteimprove/alfa-json';
 
 // @public (undocumented)
-export interface Collection<T> extends Functor<T>, Applicative<T>, Monad<T>, Foldable<T>, Equatable, Hashable {
+export interface Collection<T> extends Functor<T>, Monad<T>, Foldable<T>, Applicative<T>, Equatable, Hashable {
     // (undocumented)
     apply<U>(mapper: Collection<Mapper<T, U>>): Collection<U>;
     // (undocumented)
@@ -47,8 +47,6 @@ export interface Collection<T> extends Functor<T>, Applicative<T>, Monad<T>, Fol
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, Collection<U>>): Collection<U>;
     // (undocumented)
-    flatten<T>(this: Collection<Collection<T>>): Collection<T>;
-    // (undocumented)
     forEach(callback: Callback<T>): void;
     // (undocumented)
     includes(value: T): boolean;
@@ -73,7 +71,9 @@ export interface Collection<T> extends Functor<T>, Applicative<T>, Monad<T>, Fol
 // @public (undocumented)
 export namespace Collection {
     // (undocumented)
-    export interface Indexed<T> extends Collection<T>, Iterable_2<T>, Comparable<Iterable_2<T>>, Serializable<Indexed.JSON<T>> {
+    export function compare<T extends Comparable<T>>(a: Indexed<T>, b: Iterable_2<T>): Comparison;
+    // (undocumented)
+    export interface Indexed<T> extends Collection<T>, Iterable_2<T>, Serializable<Indexed.JSON<T>> {
         // (undocumented)
         append(value: T): Indexed<T>;
         // (undocumented)
@@ -83,9 +83,7 @@ export namespace Collection {
         // (undocumented)
         collectFirst<U>(mapper: Mapper<T, Option<U>, [index: number]>): Option<U>;
         // (undocumented)
-        compare(this: Indexed<Comparable<T>>, iterable: Iterable_2<T>): Comparison;
-        // (undocumented)
-        compareWith<U = T>(iterable: Iterable_2<U>, comparer: Comparer<T, U, [index: number]>): Comparison;
+        compareWith(iterable: Iterable_2<T>, comparer: Comparer<T>): Comparison;
         // (undocumented)
         concat(iterable: Iterable_2<T>): Indexed<T>;
         // (undocumented)
@@ -107,8 +105,6 @@ export namespace Collection {
         // (undocumented)
         flatMap<U>(mapper: Mapper<T, Indexed<U>, [index: number]>): Indexed<U>;
         // (undocumented)
-        flatten<T>(this: Indexed<Indexed<T>>): Indexed<T>;
-        // (undocumented)
         forEach(callback: Callback<T, void, [index: number]>): void;
         // (undocumented)
         get(index: number): Option<T>;
@@ -165,8 +161,6 @@ export namespace Collection {
         // (undocumented)
         some(predicate: Predicate<T, [index: number]>): boolean;
         // (undocumented)
-        sort<T extends Comparable<T>>(this: Indexed<T>): Indexed<T>;
-        // (undocumented)
         sortWith(comparer: Comparer<T>): Indexed<T>;
         // (undocumented)
         subtract(iterable: Iterable_2<T>): Indexed<T>;
@@ -177,14 +171,10 @@ export namespace Collection {
         // (undocumented)
         takeLastUntil(predicate: Predicate<T, [index: number]>): Indexed<T>;
         // (undocumented)
-        takeLastWhile<U extends T>(refinement: Refinement<T, U, [index: number]>): Indexed<U>;
-        // (undocumented)
         takeLastWhile(predicate: Predicate<T, [index: number]>): Indexed<T>;
         // (undocumented)
         takeUntil(predicate: Predicate<T, [index: number]>): Indexed<T>;
         // (undocumented)
-        takeWhile<U extends T>(refinement: Refinement<T, U, [index: number]>): Indexed<U>;
-        // (undocumented)
         takeWhile(predicate: Predicate<T, [index: number]>): Indexed<T>;
         // (undocumented)
         trim(predicate: Predicate<T, [index: number]>): Indexed<T>;
@@ -229,8 +219,6 @@ export namespace Collection {
         // (undocumented)
         flatMap<U>(mapper: Mapper<V, Keyed<K, U>, [key: K]>): Keyed<K, U>;
         // (undocumented)
-        flatten<K, V>(this: Keyed<K, Keyed<K, V>>): Keyed<K, V>;
-        // (undocumented)
         forEach(callback: Callback<V, void, [key: K]>): void;
         // (undocumented)
         get(key: K): Option<V>;
@@ -263,11 +251,13 @@ export namespace Collection {
     export namespace Keyed {
         // (undocumented)
         export type JSON<K, V> = Array<[
-        Serializable.ToJSON<K>,
-        Serializable.ToJSON<V>
+            Serializable.ToJSON<K>,
+            Serializable.ToJSON<V>
         ]>;
     }
     // (undocumented)
+    export function sort<T extends Comparable<T>>(collection: Indexed<T>): Indexed<T>;
+    // (undocumented)
     export interface Unkeyed<T> extends Collection<T>, Iterable_2<T>, Serializable<Unkeyed.JSON<T>> {
         // (undocumented)
         add(value: T): Unkeyed<T>;
@@ -298,8 +288,6 @@ export namespace Collection {
         // (undocumented)
         flatMap<U>(mapper: Mapper<T, Unkeyed<U>>): Unkeyed<U>;
         // (undocumented)
-        flatten<T>(this: Unkeyed<Unkeyed<T>>): Unkeyed<T>;
-        // (undocumented)
         forEach(callback: Callback<T>): void;
         // (undocumented)
         get(value: T): Option<T>;
@@ -333,6 +321,7 @@ export namespace Collection {
     }
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-comparable.api.md b/docs/review/api/alfa-comparable.api.md
index 19b33ea84c..fd1f8d2f65 100644
--- a/docs/review/api/alfa-comparable.api.md
+++ b/docs/review/api/alfa-comparable.api.md
@@ -4,38 +4,48 @@
 
 ```ts
 
-// @public
+// @public (undocumented)
 export interface Comparable<T> {
+    // (undocumented)
     compare(value: T): Comparison;
 }
 
-// @public
+// @public (undocumented)
 export namespace Comparable {
+    // (undocumented)
     export function compare(a: string, b: string): Comparison;
+    // (undocumented)
     export function compare(a: number, b: number): Comparison;
+    // (undocumented)
     export function compare(a: bigint, b: bigint): Comparison;
+    // (undocumented)
     export function compare(a: boolean, b: boolean): Comparison;
-    export function compare<T extends Comparable<U>, U = T>(a: T, b: U): Comparison;
+    // (undocumented)
+    export function compare<T>(a: Comparable<T>, b: T): Comparison;
     // (undocumented)
     export function compareBigInt(a: bigint, b: bigint): Comparison;
     // (undocumented)
     export function compareBoolean(a: boolean, b: boolean): Comparison;
     // (undocumented)
-    export function compareComparable<T extends Comparable<U>, U = T>(a: T, b: U): Comparison;
+    export function compareComparable<T>(a: Comparable<T>, b: T): Comparison;
     // (undocumented)
     export function compareNumber(a: number, b: number): Comparison;
     // (undocumented)
     export function compareString(a: string, b: string): Comparison;
+    // (undocumented)
     export function isComparable<T>(value: unknown): value is Comparable<T>;
-    export function isEqual<T>(a: Comparable<T>, b: T): boolean;
+    // (undocumented)
     export function isGreaterThan<T>(a: Comparable<T>, b: T): boolean;
+    // (undocumented)
     export function isGreaterThanOrEqual<T>(a: Comparable<T>, b: T): boolean;
+    // (undocumented)
     export function isLessThan<T>(a: Comparable<T>, b: T): boolean;
+    // (undocumented)
     export function isLessThanOrEqual<T>(a: Comparable<T>, b: T): boolean;
 }
 
 // @public (undocumented)
-export type Comparer<T, U = T, A extends Array<unknown> = []> = (a: T, b: U, ...args: A) => Comparison;
+export type Comparer<T, A extends Array<unknown> = []> = (a: T, b: T, ...args: A) => Comparison;
 
 // @public (undocumented)
 export enum Comparison {
@@ -47,6 +57,7 @@ export enum Comparison {
     Less = -1
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-css.api.md b/docs/review/api/alfa-css.api.md
index 632ae7a5fe..b03c580ad5 100644
--- a/docs/review/api/alfa-css.api.md
+++ b/docs/review/api/alfa-css.api.md
@@ -72,7 +72,7 @@ export class Block implements Iterable<Token>, Equatable, Serializable {
     toString(): string;
     // (undocumented)
     get value(): Array<Token>;
-}
+    }
 
 // @public (undocumented)
 export namespace Block {
@@ -333,7 +333,7 @@ export namespace Calculation {
         get type(): "value";
         // (undocumented)
         get value(): Numeric;
-    }
+        }
     // (undocumented)
     export namespace Value {
         // (undocumented)
@@ -428,7 +428,7 @@ export class Component implements Iterable<Token>, Equatable, Serializable {
     toString(): string;
     // (undocumented)
     get value(): Array<Token>;
-}
+    }
 
 // @public (undocumented)
 export namespace Component {
@@ -488,7 +488,7 @@ export class Declaration implements Iterable<Token>, Equatable, Serializable {
     toString(): string;
     // (undocumented)
     get value(): Array<Token>;
-}
+    }
 
 // @public (undocumented)
 export namespace Declaration {
@@ -604,7 +604,7 @@ class Function_2 implements Iterable<Token>, Equatable, Serializable {
     toString(): string;
     // (undocumented)
     get value(): Array<Token>;
-}
+    }
 
 // @public (undocumented)
 namespace Function_2 {
@@ -622,6 +622,7 @@ namespace Function_2 {
     const // (undocumented)
     parse: <T>(name?: string | undefined, body?: Parser<Slice<Token>, T, string, []> | undefined) => Parser<Slice<Token>, readonly [Function_2, T], string, []>;
 }
+
 export { Function_2 as Function }
 
 // @public (undocumented)
@@ -738,7 +739,7 @@ export class Hex extends Value<"color"> {
     get type(): "color";
     // (undocumented)
     get value(): number;
-}
+    }
 
 // @public (undocumented)
 export namespace Hex {
@@ -943,7 +944,7 @@ export class Keyword<T extends string = string> extends Value<"keyword"> {
     get type(): "keyword";
     // (undocumented)
     get value(): T;
-}
+    }
 
 // @public (undocumented)
 export namespace Keyword {
@@ -981,7 +982,7 @@ export class Length<U extends Unit.Length = Unit.Length> extends Dimension<"leng
     // (undocumented)
     static of<U extends Unit.Length>(value: number, unit: U): Length<U>;
     // (undocumented)
-    toJSON(): Length.JSON<U>;
+    toJSON(): Length.JSON;
     // (undocumented)
     toString(): string;
     // (undocumented)
@@ -999,9 +1000,9 @@ export namespace Length {
     const // (undocumented)
     parse: Parser<Slice<Token>, Length, string>;
     // (undocumented)
-    export interface JSON<U extends Unit.Length = Unit.Length> extends Dimension.JSON<"length"> {
+    export interface JSON extends Dimension.JSON<"length"> {
         // (undocumented)
-        unit: U;
+        unit: Unit.Length;
     }
 }
 
@@ -1057,7 +1058,7 @@ export namespace Linear {
         get type(): "corner";
         // (undocumented)
         get vertical(): Position.Vertical;
-    }
+        }
     // (undocumented)
     export namespace Corner {
         // (undocumented)
@@ -1156,7 +1157,7 @@ export class Matrix extends Value<"transform"> {
     get type(): "transform";
     // (undocumented)
     get values(): Matrix.Values<Number_2>;
-}
+    }
 
 // @public (undocumented)
 export namespace Matrix {
@@ -1171,30 +1172,30 @@ export namespace Matrix {
     }
     // (undocumented)
     export type Values<T> = [
-    [
-    T,
-    T,
-    T,
-    T
-    ],
-    [
-    T,
-    T,
-    T,
-    T
-    ],
-    [
-    T,
-    T,
-    T,
-    T
-    ],
-    [
-    T,
-    T,
-    T,
-    T
-    ]
+        [
+            T,
+            T,
+            T,
+            T
+        ],
+        [
+            T,
+            T,
+            T,
+            T
+        ],
+        [
+            T,
+            T,
+            T,
+            T
+        ],
+        [
+            T,
+            T,
+            T,
+            T
+        ]
     ];
     const // (undocumented)
     parse: Parser<Slice<Token>, Matrix, string>;
@@ -1311,6 +1312,7 @@ namespace Number_2 {
     const // (undocumented)
     parse: Parser<Slice<Token>, Number_2, string>;
 }
+
 export { Number_2 as Number }
 
 // @public (undocumented)
@@ -1430,7 +1432,7 @@ export class Polygon<F extends Polygon.Fill = Polygon.Fill, V extends Length | P
     get type(): "basic-shape";
     // (undocumented)
     get vertices(): ReadonlyArray<Polygon.Vertex<V>>;
-}
+    }
 
 // @public (undocumented)
 export namespace Polygon {
@@ -1469,7 +1471,7 @@ export class Position<H extends Position.Component<Position.Horizontal> = Positi
     get type(): "position";
     // (undocumented)
     get vertical(): V;
-}
+    }
 
 // @public (undocumented)
 export namespace Position {
@@ -1637,7 +1639,7 @@ export namespace Radial {
         get type(): "ellipse";
         // (undocumented)
         get vertical(): R;
-    }
+        }
     // (undocumented)
     export namespace Ellipse {
         // (undocumented)
@@ -1749,7 +1751,7 @@ export class Radius<R extends Length | Percentage | Radius.Side = Length | Perce
     get type(): "basic-shape";
     // (undocumented)
     get value(): R;
-}
+    }
 
 // @public (undocumented)
 export namespace Radius {
@@ -1905,7 +1907,7 @@ export class Rotate<A extends Angle = Angle> extends Value<"transform"> {
     get y(): Number_2;
     // (undocumented)
     get z(): Number_2;
-}
+    }
 
 // @public (undocumented)
 export namespace Rotate {
@@ -1948,7 +1950,7 @@ export class Scale extends Value<"transform"> {
     get x(): Number_2;
     // (undocumented)
     get y(): Number_2;
-}
+    }
 
 // @public (undocumented)
 export namespace Scale {
@@ -1993,7 +1995,7 @@ export class Shadow<V extends Length = Length, H extends Length = V, B extends L
     get type(): "shadow";
     // (undocumented)
     get vertical(): V;
-}
+    }
 
 // @public (undocumented)
 export namespace Shadow {
@@ -2071,7 +2073,7 @@ export class Skew<X extends Angle = Angle, Y extends Angle = Angle> extends Valu
     get x(): X;
     // (undocumented)
     get y(): Y;
-}
+    }
 
 // @public (undocumented)
 export namespace Skew {
@@ -2106,7 +2108,7 @@ class String_2 extends Value<"string"> {
     get type(): "string";
     // (undocumented)
     get value(): string;
-}
+    }
 
 // @public (undocumented)
 namespace String_2 {
@@ -2120,6 +2122,7 @@ namespace String_2 {
     const // (undocumented)
     parse: Parser<Slice<Token>, String_2, string>;
 }
+
 export { String_2 as String }
 
 // @public (undocumented)
@@ -2152,7 +2155,7 @@ export namespace Token {
         get type(): "at-keyword";
         // (undocumented)
         get value(): string;
-    }
+        }
     // (undocumented)
     export namespace AtKeyword {
         // (undocumented)
@@ -2372,7 +2375,7 @@ export namespace Token {
         get type(): "delim";
         // (undocumented)
         get value(): number;
-    }
+        }
     const // (undocumented)
     url: typeof URL.of, // (undocumented)
     isURL: typeof URL.isURL;
@@ -2410,7 +2413,7 @@ export namespace Token {
         get unit(): string;
         // (undocumented)
         get value(): number;
-    }
+        }
     // (undocumented)
     export namespace Dimension {
         // (undocumented)
@@ -2449,7 +2452,7 @@ export namespace Token {
         get type(): "function";
         // (undocumented)
         get value(): string;
-    }
+        }
     // (undocumented)
     export namespace Function {
         // (undocumented)
@@ -2483,7 +2486,7 @@ export namespace Token {
         get type(): "hash";
         // (undocumented)
         get value(): string;
-    }
+        }
     // (undocumented)
     export namespace Hash {
         // (undocumented)
@@ -2514,7 +2517,7 @@ export namespace Token {
         get type(): "ident";
         // (undocumented)
         get value(): string;
-    }
+        }
     const // (undocumented)
     number: typeof Number.of, // (undocumented)
     isNumber: typeof Number.isNumber;
@@ -2552,7 +2555,7 @@ export namespace Token {
         get type(): "number";
         // (undocumented)
         get value(): number;
-    }
+        }
     const // (undocumented)
     percentage: typeof Percentage.of, // (undocumented)
     isPercentage: typeof Percentage.isPercentage;
@@ -2752,7 +2755,7 @@ export namespace Token {
         get type(): "percentage";
         // (undocumented)
         get value(): number;
-    }
+        }
     // (undocumented)
     export namespace Percentage {
         // (undocumented)
@@ -2818,7 +2821,7 @@ export namespace Token {
         get type(): "string";
         // (undocumented)
         get value(): string;
-    }
+        }
     // (undocumented)
     export namespace String {
         // (undocumented)
@@ -2852,7 +2855,7 @@ export namespace Token {
         get type(): "url";
         // (undocumented)
         get value(): string;
-    }
+        }
     // (undocumented)
     export namespace URL {
         // (undocumented)
@@ -2949,7 +2952,7 @@ export class Translate<X extends Length | Percentage = Length | Percentage, Y ex
     get y(): Y;
     // (undocumented)
     get z(): Z;
-}
+    }
 
 // @public (undocumented)
 export namespace Translate {
@@ -3040,7 +3043,7 @@ export class URL extends Value<"url"> {
     get type(): "url";
     // (undocumented)
     get url(): string;
-}
+    }
 
 // @public (undocumented)
 export namespace URL {
@@ -3083,6 +3086,7 @@ export namespace Value {
     }
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-dom.api.md b/docs/review/api/alfa-dom.api.md
index a74f2b1587..7286420907 100644
--- a/docs/review/api/alfa-dom.api.md
+++ b/docs/review/api/alfa-dom.api.md
@@ -50,7 +50,7 @@ export class Attribute extends Node {
     toString(): string;
     // (undocumented)
     get value(): string;
-}
+    }
 
 // @public (undocumented)
 export namespace Attribute {
@@ -184,7 +184,7 @@ export class Declaration implements Equatable, Serializable {
     toString(): string;
     // (undocumented)
     get value(): string;
-}
+    }
 
 // @public (undocumented)
 export namespace Declaration {
@@ -548,15 +548,13 @@ function isEditingHost(element: Element): boolean;
 function isSuggestedFocusable(element: Element): boolean;
 
 // @public (undocumented)
-export function jsx(name: string, properties?: jsx.Properties | null, ...children: jsx.Children): Element;
+export function jsx(name: string, properties?: jsx.Properties | null, ...children: Array<jsx.Child>): Element;
 
 // @public (undocumented)
 export namespace jsx {
     // (undocumented)
     export type Child = Node | string;
     // (undocumented)
-    export type Children = (Child | Children)[];
-    // (undocumented)
     export namespace JSX {
         // Warning: (ae-forgotten-export) The symbol "dom" needs to be exported by the entry point index.d.ts
         //
@@ -787,10 +785,10 @@ export namespace Node {
         };
         // (undocumented)
         "@type": [
-        "ptr:Pointer",
-        "ptr:SinglePointer",
-        "ptr:ExpressionPointer",
-        "ptr:XPathPointer"
+            "ptr:Pointer",
+            "ptr:SinglePointer",
+            "ptr:ExpressionPointer",
+            "ptr:XPathPointer"
         ];
         // (undocumented)
         "ptr:expression": string;
@@ -1178,6 +1176,7 @@ export namespace Type {
     }
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-either.api.md b/docs/review/api/alfa-either.api.md
index 4201ae7d3c..a3f91d6f89 100644
--- a/docs/review/api/alfa-either.api.md
+++ b/docs/review/api/alfa-either.api.md
@@ -4,7 +4,6 @@
 
 ```ts
 
-import { Applicative } from '@siteimprove/alfa-applicative';
 import { Equatable } from '@siteimprove/alfa-equatable';
 import { Foldable } from '@siteimprove/alfa-foldable';
 import { Functor } from '@siteimprove/alfa-functor';
@@ -19,15 +18,11 @@ import { Reducer } from '@siteimprove/alfa-reducer';
 import { Serializable } from '@siteimprove/alfa-json';
 
 // @public (undocumented)
-export interface Either<L, R = L> extends Functor<R>, Applicative<R>, Monad<R>, Foldable<R>, Iterable<L | R>, Equatable, Hashable, Serializable<Either.JSON<L, R>> {
-    // (undocumented)
-    apply<T>(mapper: Either<L, Mapper<R, T>>): Either<L, T>;
+export interface Either<L, R = L> extends Functor<L | R>, Monad<L | R>, Foldable<L | R>, Iterable<L | R>, Equatable, Hashable, Serializable<Either.JSON<L, R>> {
     // (undocumented)
     either<T>(left: Mapper<L, T>, right: Mapper<R, T>): T;
     // (undocumented)
-    flatMap<T>(mapper: Mapper<R, Either<L, T>>): Either<L, T>;
-    // (undocumented)
-    flatten<L, R>(this: Either<L, Either<L, R>>): Either<L, R>;
+    flatMap<T>(mapper: Mapper<L | R, Either<T, T>>): Either<T, T>;
     // (undocumented)
     get(): L | R;
     // (undocumented)
@@ -37,9 +32,9 @@ export interface Either<L, R = L> extends Functor<R>, Applicative<R>, Monad<R>,
     // (undocumented)
     left(): Option<L>;
     // (undocumented)
-    map<T>(mapper: Mapper<R, T>): Either<L, T>;
+    map<T>(mapper: Mapper<L | R, T>): Either<T, T>;
     // (undocumented)
-    reduce<T>(reducer: Reducer<R, T>, accumulator: T): T;
+    reduce<T>(reducer: Reducer<L | R, T>, accumulator: T): T;
     // (undocumented)
     right(): Option<R>;
     // (undocumented)
@@ -65,17 +60,13 @@ export class Left<L> implements Either<L, never> {
     // (undocumented)
     [Symbol.iterator](): Iterator<L>;
     // (undocumented)
-    apply(): Left<L>;
-    // (undocumented)
     either<T>(left: Mapper<L, T>): T;
     // (undocumented)
     equals<L>(value: Left<L>): boolean;
     // (undocumented)
     equals(value: unknown): value is this;
     // (undocumented)
-    flatMap(): Left<L>;
-    // (undocumented)
-    flatten<L, R>(this: Either<L, never>): Either<L, R>;
+    flatMap<T>(mapper: Mapper<L, Either<T, T>>): Either<T, T>;
     // (undocumented)
     get(): L;
     // (undocumented)
@@ -87,18 +78,18 @@ export class Left<L> implements Either<L, never> {
     // (undocumented)
     left(): Option<L>;
     // (undocumented)
-    map(): Left<L>;
+    map<T>(mapper: Mapper<L, T>): Either<T, T>;
     // (undocumented)
     static of<L>(value: L): Left<L>;
     // (undocumented)
-    reduce<T>(reducer: unknown, accumulator: T): T;
+    reduce<T>(reducer: Reducer<L, T>, accumulator: T): T;
     // (undocumented)
     right(): None;
     // (undocumented)
     toJSON(): Left.JSON<L>;
     // (undocumented)
     toString(): string;
-}
+    }
 
 // @public (undocumented)
 export namespace Left {
@@ -122,17 +113,13 @@ export class Right<R> implements Either<never, R> {
     // (undocumented)
     [Symbol.iterator](): Iterator<R>;
     // (undocumented)
-    apply<L, T>(mapper: Either<L, Mapper<R, T>>): Either<L, T>;
-    // (undocumented)
     either<T>(left: unknown, right: Mapper<R, T>): T;
     // (undocumented)
     equals<R>(value: Right<R>): boolean;
     // (undocumented)
     equals(value: unknown): value is this;
     // (undocumented)
-    flatMap<L, T>(mapper: Mapper<R, Either<L, T>>): Either<L, T>;
-    // (undocumented)
-    flatten<L, R>(this: Right<Either<L, R>>): Either<L, R>;
+    flatMap<T>(mapper: Mapper<R, Either<T, T>>): Either<T, T>;
     // (undocumented)
     get(): R;
     // (undocumented)
@@ -144,7 +131,7 @@ export class Right<R> implements Either<never, R> {
     // (undocumented)
     left(): None;
     // (undocumented)
-    map<T>(mapper: Mapper<R, T>): Right<T>;
+    map<T>(mapper: Mapper<R, T>): Either<T, T>;
     // (undocumented)
     static of<R>(value: R): Right<R>;
     // (undocumented)
@@ -155,7 +142,7 @@ export class Right<R> implements Either<never, R> {
     toJSON(): Right.JSON<R>;
     // (undocumented)
     toString(): string;
-}
+    }
 
 // @public (undocumented)
 export namespace Right {
@@ -174,6 +161,7 @@ export namespace Right {
     }
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-equatable.api.md b/docs/review/api/alfa-equatable.api.md
index 5c5c381baa..6d84a1d6dc 100644
--- a/docs/review/api/alfa-equatable.api.md
+++ b/docs/review/api/alfa-equatable.api.md
@@ -4,18 +4,19 @@
 
 ```ts
 
-// @public
+// @public (undocumented)
 export interface Equatable {
     equals(value: this): boolean;
     equals(value: unknown): value is this;
 }
 
-// @public
+// @public (undocumented)
 export namespace Equatable {
     export function equals(a: unknown, b: unknown): boolean;
     export function isEquatable(value: unknown): value is Equatable;
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-future.api.md b/docs/review/api/alfa-future.api.md
index dce35c2b1b..bf2ca03fcd 100644
--- a/docs/review/api/alfa-future.api.md
+++ b/docs/review/api/alfa-future.api.md
@@ -15,7 +15,7 @@ import { Thenable } from '@siteimprove/alfa-thenable';
 import { Thunk } from '@siteimprove/alfa-thunk';
 
 // @public (undocumented)
-export abstract class Future<T> implements Functor<T>, Applicative<T>, Monad<T>, Thenable<T>, AsyncIterable<T> {
+export abstract class Future<T> implements Functor<T>, Monad<T>, Applicative<T>, Thenable<T>, AsyncIterable<T> {
     // (undocumented)
     [Symbol.asyncIterator](): AsyncIterator<T>;
     // (undocumented)
@@ -25,8 +25,6 @@ export abstract class Future<T> implements Functor<T>, Applicative<T>, Monad<T>,
     // (undocumented)
     abstract flatMap<U>(mapper: Mapper<T, Future<U>>): Future<U>;
     // (undocumented)
-    flatten<T>(this: Future<Future<T>>): Future<T>;
-    // (undocumented)
     get(): T;
     // (undocumented)
     abstract isDeferred(): boolean;
@@ -72,6 +70,7 @@ export namespace Future {
     export function traverse<T, U>(values: Iterable_2<T>, mapper: Mapper<T, Future<U>, [index: number]>): Future<Iterable_2<U>>;
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-iterable.api.md b/docs/review/api/alfa-iterable.api.md
index 0826223dd0..28a6342681 100644
--- a/docs/review/api/alfa-iterable.api.md
+++ b/docs/review/api/alfa-iterable.api.md
@@ -30,9 +30,9 @@ namespace Iterable_2 {
     // (undocumented)
     function collectFirst<T, U>(iterable: Iterable_2<T>, mapper: Mapper<T, Option<U>, [index: number]>): Option<U>;
     // (undocumented)
-    function compare<T extends Comparable<U>, U = T>(a: Iterable_2<T>, b: Iterable_2<U>): Comparison;
+    function compare<T extends Comparable<T>>(a: Iterable_2<T>, b: Iterable_2<T>): Comparison;
     // (undocumented)
-    function compareWith<T, U = T>(a: Iterable_2<T>, b: Iterable_2<U>, comparer: Comparer<T, U, [index: number]>): Comparison;
+    function compareWith<T>(a: Iterable_2<T>, b: Iterable_2<T>, comparer: Comparer<T>): Comparison;
     // (undocumented)
     function concat<T>(iterable: Iterable_2<T>, ...iterables: Array<Iterable_2<T>>): Iterable_2<T>;
     // (undocumented)
@@ -144,14 +144,10 @@ namespace Iterable_2 {
     // (undocumented)
     function takeLastUntil<T>(iterable: Iterable_2<T>, predicate: Predicate<T, [index: number]>): Iterable_2<T>;
     // (undocumented)
-    function takeLastWhile<T, U extends T>(iterable: Iterable_2<T>, refinement: Refinement<T, U, [index: number]>): Iterable_2<U>;
-    // (undocumented)
     function takeLastWhile<T>(iterable: Iterable_2<T>, predicate: Predicate<T, [index: number]>): Iterable_2<T>;
     // (undocumented)
     function takeUntil<T>(iterable: Iterable_2<T>, predicate: Predicate<T, [index: number]>): Iterable_2<T>;
     // (undocumented)
-    function takeWhile<T, U extends T>(iterable: Iterable_2<T>, refinement: Refinement<T, U, [index: number]>): Iterable_2<U>;
-    // (undocumented)
     function takeWhile<T>(iterable: Iterable_2<T>, predicate: Predicate<T, [index: number]>): Iterable_2<T>;
     // (undocumented)
     function toJSON<T>(iterable: Iterable_2<T>): Array<Serializable.ToJSON<T>>;
@@ -164,8 +160,10 @@ namespace Iterable_2 {
     // (undocumented)
     function zip<T, U = T>(a: Iterable_2<T>, b: Iterable_2<U>): Iterable_2<[T, U]>;
 }
+
 export { Iterable_2 as Iterable }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-lazy.api.md b/docs/review/api/alfa-lazy.api.md
index 15e97d2666..69bb3907c8 100644
--- a/docs/review/api/alfa-lazy.api.md
+++ b/docs/review/api/alfa-lazy.api.md
@@ -4,7 +4,6 @@
 
 ```ts
 
-import { Applicative } from '@siteimprove/alfa-applicative';
 import { Equatable } from '@siteimprove/alfa-equatable';
 import { Functor } from '@siteimprove/alfa-functor';
 import { Mapper } from '@siteimprove/alfa-mapper';
@@ -13,20 +12,16 @@ import { Serializable } from '@siteimprove/alfa-json';
 import { Thunk } from '@siteimprove/alfa-thunk';
 
 // @public (undocumented)
-export class Lazy<T> implements Functor<T>, Applicative<T>, Monad<T>, Iterable<T>, Equatable, Serializable<Lazy.JSON<T>> {
+export class Lazy<T> implements Functor<T>, Monad<T>, Iterable<T>, Equatable, Serializable<Lazy.JSON<T>> {
     // (undocumented)
     [Symbol.iterator](): Iterator<T>;
     // (undocumented)
-    apply<U>(mapper: Lazy<Mapper<T, U>>): Lazy<U>;
-    // (undocumented)
     equals<T>(value: Lazy<T>): boolean;
     // (undocumented)
     equals(value: unknown): value is this;
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, Lazy<U>>): Lazy<U>;
     // (undocumented)
-    flatten<T>(this: Lazy<Lazy<T>>): Lazy<T>;
-    // (undocumented)
     static force<T>(value: T): Lazy<T>;
     // (undocumented)
     force(): T;
@@ -42,7 +37,7 @@ export class Lazy<T> implements Functor<T>, Applicative<T>, Monad<T>, Iterable<T
     toString(): string;
     // (undocumented)
     toThunk(): Thunk<T>;
-}
+    }
 
 // @public (undocumented)
 export namespace Lazy {
@@ -50,6 +45,7 @@ export namespace Lazy {
     export type JSON<T> = Serializable.ToJSON<T>;
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-list.api.md b/docs/review/api/alfa-list.api.md
index fe19ec00fa..9d27152183 100644
--- a/docs/review/api/alfa-list.api.md
+++ b/docs/review/api/alfa-list.api.md
@@ -82,7 +82,7 @@ export class Leaf<T> implements Node<T> {
     set(index: number, value: T): Leaf<T>;
     // (undocumented)
     get values(): Array<T>;
-}
+    }
 
 // @public (undocumented)
 export class List<T> implements Collection.Indexed<T> {
@@ -97,9 +97,7 @@ export class List<T> implements Collection.Indexed<T> {
     // (undocumented)
     collectFirst<U>(mapper: Mapper<T, Option<U>, [index: number]>): Option<U>;
     // (undocumented)
-    compare(this: List<Comparable<T>>, iterable: Iterable_2<T>): Comparison;
-    // (undocumented)
-    compareWith<U = T>(iterable: Iterable_2<U>, comparer: Comparer<T, U, [index: number]>): Comparison;
+    compareWith(iterable: Iterable_2<T>, comparer: Comparer<T>): Comparison;
     // (undocumented)
     concat(iterable: Iterable_2<T>): List<T>;
     // (undocumented)
@@ -127,8 +125,6 @@ export class List<T> implements Collection.Indexed<T> {
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, List<U>, [index: number]>): List<U>;
     // (undocumented)
-    flatten<T>(this: List<List<T>>): List<T>;
-    // (undocumented)
     forEach(callback: Callback<T, void, [index: number]>): void;
     // (undocumented)
     get(index: number): Option<T>;
@@ -193,8 +189,6 @@ export class List<T> implements Collection.Indexed<T> {
     // (undocumented)
     some(predicate: Predicate<T, [index: number]>): boolean;
     // (undocumented)
-    sort<T extends Comparable<T>>(this: List<T>): List<T>;
-    // (undocumented)
     sortWith(comparer: Comparer<T>): List<T>;
     // (undocumented)
     subtract(iterable: Iterable_2<T>): List<T>;
@@ -205,14 +199,10 @@ export class List<T> implements Collection.Indexed<T> {
     // (undocumented)
     takeLastUntil(predicate: Predicate<T, [index: number]>): List<T>;
     // (undocumented)
-    takeLastWhile<U extends T>(refinement: Refinement<T, U, [index: number]>): List<U>;
-    // (undocumented)
     takeLastWhile(predicate: Predicate<T, [index: number]>): List<T>;
     // (undocumented)
     takeUntil(predicate: Predicate<T, [index: number]>): List<T>;
     // (undocumented)
-    takeWhile<U extends T>(refinement: Refinement<T, U, [index: number]>): List<U>;
-    // (undocumented)
     takeWhile(predicate: Predicate<T, [index: number]>): List<T>;
     // (undocumented)
     toArray(): Array_2<T>;
@@ -232,6 +222,8 @@ export class List<T> implements Collection.Indexed<T> {
 
 // @public (undocumented)
 export namespace List {
+    // (undocumented)
+    export function compare<T extends Comparable<T>>(a: List<T>, b: Iterable_2<T>): Comparison;
     // (undocumented)
     export function from<T>(iterable: Iterable_2<T>): List<T>;
     // (undocumented)
@@ -244,6 +236,8 @@ export namespace List {
     export function isList<T>(value: unknown): value is List<T>;
     // (undocumented)
     export type JSON<T> = Collection.Indexed.JSON<T>;
+    // (undocumented)
+    export function sort<T extends Comparable<T>>(list: List<T>): List<T>;
 }
 
 // Warning: (ae-internal-missing-underscore) The name "Node" should be prefixed with an underscore because the declaration is marked as @internal
@@ -276,6 +270,7 @@ export namespace Node {
     export function underflow(shift: number): number;
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-map.api.md b/docs/review/api/alfa-map.api.md
index 19555d49ac..806ad8f8e8 100644
--- a/docs/review/api/alfa-map.api.md
+++ b/docs/review/api/alfa-map.api.md
@@ -78,21 +78,22 @@ export class Leaf<K, V> implements Node<K, V> {
     set(key: K, value: V, hash: number, shift: number): Status<Node<K, V>>;
     // (undocumented)
     get value(): V;
-}
+    }
 
 // @public (undocumented)
 class Map_2<K, V> implements Collection.Keyed<K, V> {
     // (undocumented)
     [Symbol.iterator](): Iterator<[K, V]>;
+    // (undocumented)
     apply<U>(mapper: Map_2<K, Mapper<V, U>>): Map_2<K, U>;
     // (undocumented)
-    collect<U>(mapper: Mapper<V, Option<U>, [key: K]>): Map_2<K, U>;
+    collect<U>(mapper: Mapper<V, Option<U>, [K]>): Map_2<K, U>;
     // (undocumented)
-    collectFirst<U>(mapper: Mapper<V, Option<U>, [key: K]>): Option<U>;
+    collectFirst<U>(mapper: Mapper<V, Option<U>, [K]>): Option<U>;
     // (undocumented)
     concat(iterable: Iterable_2<readonly [K, V]>): Map_2<K, V>;
     // (undocumented)
-    count(predicate: Predicate<V, [key: K]>): number;
+    count(predicate: Predicate<V, [K]>): number;
     // (undocumented)
     delete(key: K): Map_2<K, V>;
     // (undocumented)
@@ -104,21 +105,19 @@ class Map_2<K, V> implements Collection.Keyed<K, V> {
     // (undocumented)
     equals(value: unknown): value is this;
     // (undocumented)
-    every(predicate: Predicate<V, [key: K]>): boolean;
-    // (undocumented)
-    filter<U extends V>(refinement: Refinement<V, U, [key: K]>): Map_2<K, U>;
+    every(predicate: Predicate<V, [K]>): boolean;
     // (undocumented)
-    filter(predicate: Predicate<V, [key: K]>): Map_2<K, V>;
+    filter<U extends V>(refinement: Refinement<V, U, [K]>): Map_2<K, U>;
     // (undocumented)
-    find<U extends V>(refinement: Refinement<V, U, [key: K]>): Option<U>;
+    filter(predicate: Predicate<V, [K]>): Map_2<K, V>;
     // (undocumented)
-    find(predicate: Predicate<V, [key: K]>): Option<V>;
+    find<U extends V>(refinement: Refinement<V, U, [K]>): Option<U>;
     // (undocumented)
-    flatMap<L, U>(mapper: Mapper<V, Map_2<L, U>, [key: K]>): Map_2<L, U>;
+    find(predicate: Predicate<V, [K]>): Option<V>;
     // (undocumented)
-    flatten<K, V>(this: Map_2<K, Map_2<K, V>>): Map_2<K, V>;
+    flatMap<L, U>(mapper: Mapper<V, Map_2<L, U>, [K]>): Map_2<L, U>;
     // (undocumented)
-    forEach(callback: Callback<V, void, [key: K]>): void;
+    forEach(callback: Callback<V, void, [K]>): void;
     // (undocumented)
     get(key: K): Option<V>;
     // (undocumented)
@@ -136,23 +135,23 @@ class Map_2<K, V> implements Collection.Keyed<K, V> {
     // (undocumented)
     keys(): Iterable_2<K>;
     // (undocumented)
-    map<U>(mapper: Mapper<V, U, [key: K]>): Map_2<K, U>;
+    map<U>(mapper: Mapper<V, U, [K]>): Map_2<K, U>;
     // (undocumented)
-    none(predicate: Predicate<V, [key: K]>): boolean;
+    none(predicate: Predicate<V, [K]>): boolean;
     // (undocumented)
     static of<K, V>(...entries: Array_2<readonly [K, V]>): Map_2<K, V>;
     // (undocumented)
-    reduce<R>(reducer: Reducer<V, R, [key: K]>, accumulator: R): R;
+    reduce<R>(reducer: Reducer<V, R, [K]>, accumulator: R): R;
     // (undocumented)
-    reject<U extends V>(refinement: Refinement<V, U, [key: K]>): Map_2<K, Exclude<V, U>>;
+    reject<U extends V>(refinement: Refinement<V, U, [K]>): Map_2<K, Exclude<V, U>>;
     // (undocumented)
-    reject(predicate: Predicate<V, [key: K]>): Map_2<K, V>;
+    reject(predicate: Predicate<V, [K]>): Map_2<K, V>;
     // (undocumented)
     set(key: K, value: V): Map_2<K, V>;
     // (undocumented)
     get size(): number;
     // (undocumented)
-    some(predicate: Predicate<V, [key: K]>): boolean;
+    some(predicate: Predicate<V, [K]>): boolean;
     // (undocumented)
     subtract(iterable: Iterable_2<readonly [K, V]>): Map_2<K, V>;
     // (undocumented)
@@ -180,6 +179,7 @@ namespace Map_2 {
     // (undocumented)
     type JSON<K, V> = Collection.Keyed.JSON<K, V>;
 }
+
 export { Map_2 as Map }
 
 // Warning: (ae-internal-missing-underscore) The name "Node" should be prefixed with an underscore because the declaration is marked as @internal
@@ -234,6 +234,7 @@ export class Sparse<K, V> implements Node<K, V> {
     set(key: K, value: V, hash: number, shift: number): Status<Node<K, V>>;
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-monad.api.md b/docs/review/api/alfa-monad.api.md
index ced96cd5c1..dc39da4a67 100644
--- a/docs/review/api/alfa-monad.api.md
+++ b/docs/review/api/alfa-monad.api.md
@@ -4,22 +4,15 @@
 
 ```ts
 
-import { Applicative } from '@siteimprove/alfa-applicative';
-import { Functor } from '@siteimprove/alfa-functor';
 import { Mapper } from '@siteimprove/alfa-mapper';
 
 // @public (undocumented)
-export interface Monad<T> extends Functor<T>, Applicative<T> {
-    // (undocumented)
-    apply<U>(mapper: Monad<Mapper<T, U>>): Monad<U>;
+export interface Monad<T> {
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, Monad<U>>): Monad<U>;
-    // (undocumented)
-    flatten<T>(this: Monad<Monad<T>>): Monad<T>;
-    // (undocumented)
-    map<U>(mapper: Mapper<T, U>): Monad<U>;
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-option.api.md b/docs/review/api/alfa-option.api.md
index 4c19f75c83..bc9c1e4330 100644
--- a/docs/review/api/alfa-option.api.md
+++ b/docs/review/api/alfa-option.api.md
@@ -41,7 +41,7 @@ export namespace None {
 }
 
 // @public (undocumented)
-export interface Option<T> extends Functor<T>, Applicative<T>, Monad<T>, Foldable<T>, Iterable<T>, Equatable, Hashable, Serializable<Option.JSON<T>> {
+export interface Option<T> extends Functor<T>, Monad<T>, Foldable<T>, Applicative<T>, Iterable<T>, Equatable, Hashable, Serializable<Option.JSON<T>> {
     // (undocumented)
     and<U>(option: Option<U>): Option<U>;
     // (undocumented)
@@ -49,9 +49,7 @@ export interface Option<T> extends Functor<T>, Applicative<T>, Monad<T>, Foldabl
     // (undocumented)
     apply<U>(mapper: Option<Mapper<T, U>>): Option<U>;
     // (undocumented)
-    compare(this: Option<Comparable<T>>, option: Option<T>): Comparison;
-    // (undocumented)
-    compareWith<U = T>(option: Option<U>, comparer: Comparer<T, U>): Comparison;
+    compareWith(option: Option<T>, comparer: Comparer<T>): Comparison;
     // (undocumented)
     every(predicate: Predicate<T>): boolean;
     // (undocumented)
@@ -61,8 +59,6 @@ export interface Option<T> extends Functor<T>, Applicative<T>, Monad<T>, Foldabl
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, Option<U>>): Option<U>;
     // (undocumented)
-    flatten<T>(this: Option<Option<T>>): Option<T>;
-    // (undocumented)
     get(): T;
     // (undocumented)
     getOr<U>(value: U): T | U;
@@ -98,9 +94,13 @@ export interface Option<T> extends Functor<T>, Applicative<T>, Monad<T>, Foldabl
 
 // @public (undocumented)
 export namespace Option {
+    // (undocumented)
+    export function compare<T extends Comparable<T>>(a: Option<T>, b: Option<T>): Comparison;
     // (undocumented)
     export function empty<T>(): Option<T>;
     // (undocumented)
+    export function flatten<T>(option: Option<Option<T>>): Option<T>;
+    // (undocumented)
     export function from<T>(value: T | null | undefined): Option<NonNullable<T>>;
     // (undocumented)
     export function isNone<T>(value: Iterable<T>): value is None;
@@ -133,9 +133,7 @@ export class Some<T> implements Option<T> {
     // (undocumented)
     apply<U>(mapper: Option<Mapper<T, U>>): Option<U>;
     // (undocumented)
-    compare(this: Option<Comparable<T>>, option: Option<T>): Comparison;
-    // (undocumented)
-    compareWith<U = T>(option: Option<U>, comparer: Comparer<T, U>): Comparison;
+    compareWith(option: Option<T>, comparer: Comparer<T>): Comparison;
     // (undocumented)
     equals(value: unknown): value is this;
     // (undocumented)
@@ -147,8 +145,6 @@ export class Some<T> implements Option<T> {
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, Option<U>>): Option<U>;
     // (undocumented)
-    flatten<T>(this: Some<Option<T>>): Option<T>;
-    // (undocumented)
     get(): T;
     // (undocumented)
     getOr(): T;
@@ -186,7 +182,7 @@ export class Some<T> implements Option<T> {
     toJSON(): Some.JSON<T>;
     // (undocumented)
     toString(): string;
-}
+    }
 
 // @public (undocumented)
 export namespace Some {
@@ -205,6 +201,7 @@ export namespace Some {
     }
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-result.api.md b/docs/review/api/alfa-result.api.md
index f7d76be8c5..8d73bb6922 100644
--- a/docs/review/api/alfa-result.api.md
+++ b/docs/review/api/alfa-result.api.md
@@ -26,11 +26,11 @@ export class Err<E> implements Result<never, E> {
     // (undocumented)
     [Symbol.iterator](): Generator<never, void, unknown>;
     // (undocumented)
-    and(): Err<E>;
+    and(): this;
     // (undocumented)
-    andThen(): Err<E>;
+    andThen(): this;
     // (undocumented)
-    apply(): Err<E>;
+    apply(): this;
     // (undocumented)
     equals(value: unknown): value is this;
     // (undocumented)
@@ -40,9 +40,7 @@ export class Err<E> implements Result<never, E> {
     // (undocumented)
     everyErr(predicate: Predicate<E>): boolean;
     // (undocumented)
-    flatMap(): Err<E>;
-    // (undocumented)
-    flatten<T, E>(this: Result<never, E>): Result<T, E>;
+    flatMap(): this;
     // (undocumented)
     get(): never;
     // (undocumented)
@@ -62,11 +60,11 @@ export class Err<E> implements Result<never, E> {
     // (undocumented)
     isOk(): this is Ok<never>;
     // (undocumented)
-    map(): Err<E>;
+    map(): this;
     // (undocumented)
     mapErr<F>(mapper: Mapper<E, F>): Err<F>;
     // (undocumented)
-    mapOrElse<U>(ok: unknown, err: Mapper<E, U>): U;
+    mapOrElse<T, U>(ok: Mapper<T, U>, err: Mapper<E, U>): U;
     // (undocumented)
     none(): boolean;
     // (undocumented)
@@ -131,8 +129,6 @@ export class Ok<T> implements Result<T, never> {
     // (undocumented)
     flatMap<U, F>(mapper: Mapper<T, Result<U, F>>): Result<U, F>;
     // (undocumented)
-    flatten<T, E>(this: Ok<Result<T, E>>): Result<T, E>;
-    // (undocumented)
     get(): T;
     // (undocumented)
     getErr(): never;
@@ -153,9 +149,9 @@ export class Ok<T> implements Result<T, never> {
     // (undocumented)
     map<U>(mapper: Mapper<T, U>): Ok<U>;
     // (undocumented)
-    mapErr(): Ok<T>;
+    mapErr(): this;
     // (undocumented)
-    mapOrElse<U>(ok: Mapper<T, U>): U;
+    mapOrElse<E, U>(ok: Mapper<T, U>): U;
     // (undocumented)
     none(predicate: Predicate<T>): boolean;
     // (undocumented)
@@ -165,9 +161,9 @@ export class Ok<T> implements Result<T, never> {
     // (undocumented)
     ok(): Option<T>;
     // (undocumented)
-    or(): Ok<T>;
+    or(): this;
     // (undocumented)
-    orElse(): Ok<T>;
+    orElse(): this;
     // (undocumented)
     reduce<U>(reducer: Reducer<T, U>, accumulator: U): U;
     // (undocumented)
@@ -182,7 +178,7 @@ export class Ok<T> implements Result<T, never> {
     toJSON(): Ok.JSON<T>;
     // (undocumented)
     toString(): string;
-}
+    }
 
 // @public (undocumented)
 export namespace Ok {
@@ -200,7 +196,7 @@ export namespace Ok {
 }
 
 // @public (undocumented)
-export interface Result<T, E = T> extends Functor<T>, Applicative<T>, Monad<T>, Foldable<T>, Iterable<T>, Equatable, Hashable, Serializable<Result.JSON<T, E>> {
+export interface Result<T, E = T> extends Functor<T>, Monad<T>, Foldable<T>, Applicative<T>, Iterable<T>, Equatable, Hashable, Serializable<Result.JSON<T, E>> {
     // (undocumented)
     and<U>(result: Result<U, E>): Result<U, E>;
     // (undocumented)
@@ -216,8 +212,6 @@ export interface Result<T, E = T> extends Functor<T>, Applicative<T>, Monad<T>,
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, Result<U, E>>): Result<U, E>;
     // (undocumented)
-    flatten<T, E>(this: Result<Result<T, E>, E>): Result<T, E>;
-    // (undocumented)
     get(): T;
     // (undocumented)
     getErr(): E;
@@ -277,6 +271,7 @@ export namespace Result {
     export function of<T, E>(value: T): Result<T, E>;
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-rules.api.md b/docs/review/api/alfa-rules.api.md
index b1d7ade697..185bbbdc57 100644
--- a/docs/review/api/alfa-rules.api.md
+++ b/docs/review/api/alfa-rules.api.md
@@ -208,7 +208,7 @@ const _default_64: Rule.Atomic<Page, Element, never>;
 const _default_65: Rule.Atomic<Page, Text, Question>;
 
 // @public (undocumented)
-const _default_66: Rule.Atomic<Page, Element, never>;
+const _default_66: Rule.Atomic<Page, Document, never>;
 
 // @public (undocumented)
 const _default_67: Rule.Atomic<Page, Element, never>;
@@ -232,16 +232,16 @@ const _default_71: Rule.Atomic<Page, Element, never>;
 const _default_72: Rule.Atomic<Page, Element, never>;
 
 // @public (undocumented)
-const _default_73: Rule.Atomic<Page, Group<Element>, Question>;
+const _default_73: Rule.Atomic<Page, Element, never>;
 
 // @public (undocumented)
-const _default_74: Rule.Atomic<Page, Element, Question>;
+const _default_74: Rule.Atomic<Page, Group<Element>, Question>;
 
 // @public (undocumented)
-const _default_75: Rule.Atomic<Page, Text, never>;
+const _default_75: Rule.Atomic<Page, Element, Question>;
 
 // @public (undocumented)
-const _default_76: Rule.Atomic<Page, Element, never>;
+const _default_76: Rule.Atomic<Page, Text, never>;
 
 // @public (undocumented)
 const _default_77: Rule.Atomic<Page, Element, never>;
@@ -250,13 +250,13 @@ const _default_77: Rule.Atomic<Page, Element, never>;
 const _default_78: Rule.Atomic<Page, Element, never>;
 
 // @public (undocumented)
-const _default_79: Rule.Atomic<Page, Document, Question>;
+const _default_79: Rule.Atomic<Page, Element, never>;
 
 // @public (undocumented)
 const _default_8: Rule.Atomic<Page, Element, never>;
 
 // @public (undocumented)
-const _default_80: Rule.Atomic<Page, Element, never>;
+const _default_80: Rule.Atomic<Page, Document, Question>;
 
 // @public (undocumented)
 const _default_81: Rule.Atomic<Page, Element, never>;
@@ -276,6 +276,9 @@ const _default_85: Rule.Atomic<Page, Element, never>;
 // @public (undocumented)
 const _default_86: Rule.Atomic<Page, Element, never>;
 
+// @public (undocumented)
+const _default_87: Rule.Atomic<Page, Element, never>;
+
 // @public (undocumented)
 const _default_9: Rule.Atomic<Page, Element, never>;
 
diff --git a/docs/review/api/alfa-selective.api.md b/docs/review/api/alfa-selective.api.md
index f7366be4f3..36d369773a 100644
--- a/docs/review/api/alfa-selective.api.md
+++ b/docs/review/api/alfa-selective.api.md
@@ -4,7 +4,6 @@
 
 ```ts
 
-import { Applicative } from '@siteimprove/alfa-applicative';
 import { Either } from '@siteimprove/alfa-either';
 import { Equatable } from '@siteimprove/alfa-equatable';
 import { Functor } from '@siteimprove/alfa-functor';
@@ -17,23 +16,18 @@ import { Refinement } from '@siteimprove/alfa-refinement';
 import { Serializable } from '@siteimprove/alfa-json';
 
 // @public (undocumented)
-export class Selective<S, T = never> implements Functor<T>, Applicative<T>, Monad<T>, Iterable<S | T>, Equatable, Hashable, Serializable<Selective.JSON<S, T>> {
+export class Selective<S, T = never> implements Functor<T>, Monad<T>, Iterable<S | T>, Equatable, Hashable, Serializable<Selective.JSON<S, T>> {
     // (undocumented)
     [Symbol.iterator](): Iterator<S | T>;
     // (undocumented)
-    apply<U>(mapper: Selective<S, Mapper<T, U>>): Selective<S, U>;
-    // (undocumented)
     else<U>(mapper: Mapper<S, U>): Selective<never, T | U>;
     // (undocumented)
     equals<S, T>(value: Selective<S, T>): boolean;
     // (undocumented)
     equals(value: unknown): value is this;
-    exhaust<T>(this: Selective<never, T>): T;
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, Selective<S, U>>): Selective<S, U>;
     // (undocumented)
-    flatten<S, T>(this: Selective<S, Selective<S, T>>): Selective<S, T>;
-    // (undocumented)
     get(): S | T;
     // (undocumented)
     hash(hash: Hash): void;
@@ -51,14 +45,16 @@ export class Selective<S, T = never> implements Functor<T>, Applicative<T>, Mona
     toJSON(): Selective.JSON<S, T>;
     // (undocumented)
     toString(): string;
-}
+    }
 
 // @public (undocumented)
 export namespace Selective {
+    export function exhaust<T>(selective: Selective<never, T>): T;
     // (undocumented)
     export type JSON<S, T = never> = Either.JSON<S, T>;
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-sequence.api.md b/docs/review/api/alfa-sequence.api.md
index 7ba65cb679..a221523e6b 100644
--- a/docs/review/api/alfa-sequence.api.md
+++ b/docs/review/api/alfa-sequence.api.md
@@ -36,9 +36,7 @@ export class Cons<T> implements Sequence<T> {
     // (undocumented)
     collectFirst<U>(mapper: Mapper<T, Option<U>, [index: number]>): Option<U>;
     // (undocumented)
-    compare(this: Sequence<Comparable<T>>, iterable: Iterable_2<T>): Comparison;
-    // (undocumented)
-    compareWith<U = T>(iterable: Iterable_2<U>, comparer: Comparer<T, U, [index: number]>): Comparison;
+    compareWith(iterable: Iterable_2<T>, comparer: Comparer<T>): Comparison;
     // (undocumented)
     concat(iterable: Iterable_2<T>): Cons<T>;
     // (undocumented)
@@ -68,8 +66,6 @@ export class Cons<T> implements Sequence<T> {
     // @internal (undocumented)
     flatMap<U>(mapper: Mapper<T, Sequence<U>, [index: number]>, index: number): Sequence<U>;
     // (undocumented)
-    flatten<T>(this: Sequence<Sequence<T>>): Sequence<T>;
-    // (undocumented)
     forEach(callback: Callback<T, void, [index: number]>): void;
     // (undocumented)
     get(index: number): Option<T>;
@@ -138,8 +134,6 @@ export class Cons<T> implements Sequence<T> {
     // (undocumented)
     some(predicate: Predicate<T, [index: number]>): boolean;
     // (undocumented)
-    sort<T extends Comparable<T>>(this: Sequence<T>): Sequence<T>;
-    // (undocumented)
     sortWith(comparer: Comparer<T>): Sequence<T>;
     // (undocumented)
     subtract(iterable: Iterable_2<T>): Sequence<T>;
@@ -150,16 +144,12 @@ export class Cons<T> implements Sequence<T> {
     // (undocumented)
     takeLastUntil(predicate: Predicate<T, [index: number]>): Sequence<T>;
     // (undocumented)
-    takeLastWhile<U extends T>(refinement: Refinement<T, U, [index: number]>): Sequence<U>;
-    // (undocumented)
     takeLastWhile(predicate: Predicate<T, [index: number]>): Sequence<T>;
     // (undocumented)
     takeUntil(predicate: Predicate<T, [index: number]>): Sequence<T>;
     // @internal (undocumented)
     takeUntil(predicate: Predicate<T, [index: number]>, index: number): Sequence<T>;
     // (undocumented)
-    takeWhile<U extends T>(refinement: Refinement<T, U, [index: number]>): Sequence<U>;
-    // (undocumented)
     takeWhile(predicate: Predicate<T, [index: number]>): Sequence<T>;
     // (undocumented)
     toArray(): Array_2<T>;
@@ -211,9 +201,7 @@ export interface Sequence<T> extends Collection.Indexed<T> {
     // (undocumented)
     collectFirst<U>(mapper: Mapper<T, Option<U>, [index: number]>): Option<U>;
     // (undocumented)
-    compare(this: Sequence<Comparable<T>>, iterable: Iterable<T>): Comparison;
-    // (undocumented)
-    compareWith<U = T>(iterable: Iterable<U>, comparer: Comparer<T, U, [index: number]>): Comparison;
+    compareWith(iterable: Iterable<T>, comparer: Comparer<T>): Comparison;
     // (undocumented)
     concat(iterable: Iterable<T>): Sequence<T>;
     // (undocumented)
@@ -235,8 +223,6 @@ export interface Sequence<T> extends Collection.Indexed<T> {
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, Sequence<U>, [index: number]>): Sequence<U>;
     // (undocumented)
-    flatten<T>(this: Sequence<Sequence<T>>): Sequence<T>;
-    // (undocumented)
     forEach(callback: Callback<T, void, [index: number]>): void;
     // (undocumented)
     get(index: number): Option<T>;
@@ -295,8 +281,6 @@ export interface Sequence<T> extends Collection.Indexed<T> {
     // (undocumented)
     some(predicate: Predicate<T, [index: number]>): boolean;
     // (undocumented)
-    sort<T extends Comparable<T>>(this: Sequence<T>): Sequence<T>;
-    // (undocumented)
     sortWith(comparer: Comparer<T>): Sequence<T>;
     // (undocumented)
     subtract(iterable: Iterable<T>): Sequence<T>;
@@ -307,14 +291,10 @@ export interface Sequence<T> extends Collection.Indexed<T> {
     // (undocumented)
     takeLastUntil(predicate: Predicate<T, [index: number]>): Sequence<T>;
     // (undocumented)
-    takeLastWhile<U extends T>(refinement: Refinement<T, U, [index: number]>): Sequence<U>;
-    // (undocumented)
     takeLastWhile(predicate: Predicate<T, [index: number]>): Sequence<T>;
     // (undocumented)
     takeUntil(predicate: Predicate<T, [index: number]>): Sequence<T>;
     // (undocumented)
-    takeWhile<U extends T>(refinement: Refinement<T, U, [index: number]>): Sequence<U>;
-    // (undocumented)
     takeWhile(predicate: Predicate<T, [index: number]>): Sequence<T>;
     // (undocumented)
     toArray(): Array_2<T>;
@@ -332,9 +312,13 @@ export interface Sequence<T> extends Collection.Indexed<T> {
 
 // @public (undocumented)
 export namespace Sequence {
+    // (undocumented)
+    export function compare<T extends Comparable<T>>(a: Sequence<T>, b: Iterable<T>): Comparison;
     // (undocumented)
     export function empty<T = never>(): Sequence<T>;
     // (undocumented)
+    export function flatten<T>(sequence: Sequence<Sequence<T>>): Sequence<T>;
+    // (undocumented)
     export function from<T>(iterable: Iterable<T>): Sequence<T>;
     // (undocumented)
     export function fromArray<T>(array: Array_2<T>): Sequence<T>;
@@ -358,8 +342,11 @@ export namespace Sequence {
     export type JSON<T> = Cons.JSON<T> | Nil.JSON;
     // (undocumented)
     export function of<T>(head: T, tail?: Lazy<Sequence<T>>): Sequence<T>;
+    // (undocumented)
+    export function sort<T extends Comparable<T>>(sequence: Sequence<T>): Sequence<T>;
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-set.api.md b/docs/review/api/alfa-set.api.md
index 80026042d7..48cde32acc 100644
--- a/docs/review/api/alfa-set.api.md
+++ b/docs/review/api/alfa-set.api.md
@@ -54,8 +54,6 @@ class Set_2<T> implements Collection.Unkeyed<T> {
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, Set_2<U>>): Set_2<U>;
     // (undocumented)
-    flatten<T>(this: Set_2<Set_2<T>>): Set_2<T>;
-    // (undocumented)
     forEach(callback: Callback<T>): void;
     // (undocumented)
     get(value: T): Option<T>;
@@ -95,7 +93,7 @@ class Set_2<T> implements Collection.Unkeyed<T> {
     toJSON(): Set_2.JSON<T>;
     // (undocumented)
     toString(): string;
-}
+    }
 
 // @public (undocumented)
 namespace Set_2 {
@@ -112,8 +110,10 @@ namespace Set_2 {
     // (undocumented)
     type JSON<T> = Collection.Unkeyed.JSON<T>;
 }
+
 export { Set_2 as Set }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-slice.api.md b/docs/review/api/alfa-slice.api.md
index 06f35bfef5..cb77b04ca3 100644
--- a/docs/review/api/alfa-slice.api.md
+++ b/docs/review/api/alfa-slice.api.md
@@ -7,7 +7,6 @@
 import { Array as Array_2 } from '@siteimprove/alfa-array';
 import { Callback } from '@siteimprove/alfa-callback';
 import { Collection } from '@siteimprove/alfa-collection';
-import { Comparable } from '@siteimprove/alfa-comparable';
 import { Comparer } from '@siteimprove/alfa-comparable';
 import { Comparison } from '@siteimprove/alfa-comparable';
 import { Hash } from '@siteimprove/alfa-hash';
@@ -34,9 +33,7 @@ export class Slice<T> implements Collection.Indexed<T> {
     // (undocumented)
     collectFirst<U>(mapper: Mapper<T, Option<U>, [index: number]>): Option<U>;
     // (undocumented)
-    compare(this: Slice<Comparable<T>>, iterable: Iterable_2<T>): Comparison;
-    // (undocumented)
-    compareWith<U = T>(iterable: Iterable_2<U>, comparer: Comparer<T, U, [index: number]>): Comparison;
+    compareWith(iterable: Iterable_2<T>, comparer: Comparer<T>): Comparison;
     // (undocumented)
     concat(iterable: Iterable_2<T>): Slice<T>;
     // (undocumented)
@@ -64,8 +61,6 @@ export class Slice<T> implements Collection.Indexed<T> {
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, Slice<U>, [index: number]>): Slice<U>;
     // (undocumented)
-    flatten<T>(this: Slice<Slice<T>>): Slice<T>;
-    // (undocumented)
     forEach(callback: Callback<T, void, [index: number]>): void;
     // (undocumented)
     get(index: number): Option<T>;
@@ -134,8 +129,6 @@ export class Slice<T> implements Collection.Indexed<T> {
     // (undocumented)
     some(predicate: Predicate<T, [index: number]>): boolean;
     // (undocumented)
-    sort<T extends Comparable<T>>(this: Slice<T>): Slice<T>;
-    // (undocumented)
     sortWith(comparer: Comparer<T>): Slice<T>;
     // (undocumented)
     subtract(iterable: Iterable_2<T>): Slice<T>;
@@ -146,14 +139,10 @@ export class Slice<T> implements Collection.Indexed<T> {
     // (undocumented)
     takeLastUntil(predicate: Predicate<T, [index: number]>): Slice<T>;
     // (undocumented)
-    takeLastWhile<U extends T>(refinement: Refinement<T, U, [index: number]>): Slice<U>;
-    // (undocumented)
     takeLastWhile(predicate: Predicate<T, [index: number]>): Slice<T>;
     // (undocumented)
     takeUntil(predicate: Predicate<T, [index: number]>): Slice<T>;
     // (undocumented)
-    takeWhile<U extends T>(refinement: Refinement<T, U, [index: number]>): Slice<U>;
-    // (undocumented)
     takeWhile(predicate: Predicate<T, [index: number]>): Slice<T>;
     // (undocumented)
     toArray(): Array_2<T>;
@@ -183,6 +172,7 @@ export namespace Slice {
     export type JSON<T> = Array_2<Serializable.ToJSON<T>>;
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/docs/review/api/alfa-style.api.md b/docs/review/api/alfa-style.api.md
index 368c4bb199..2fe9b2ebac 100644
--- a/docs/review/api/alfa-style.api.md
+++ b/docs/review/api/alfa-style.api.md
@@ -5,7 +5,6 @@
 ```ts
 
 import { Angle } from '@siteimprove/alfa-css';
-import { Applicative } from '@siteimprove/alfa-applicative';
 import { Color } from '@siteimprove/alfa-css';
 import { Context } from '@siteimprove/alfa-selector';
 import { Current } from '@siteimprove/alfa-css';
@@ -223,18 +222,14 @@ export namespace Style {
 }
 
 // @public (undocumented)
-export class Value<T = unknown> implements Functor<T>, Applicative<T>, Monad<T>, Iterable<T>, Equatable, Serializable<Value.JSON<T>> {
+export class Value<T = unknown> implements Functor<T>, Monad<T>, Iterable<T>, Equatable, Serializable<Value.JSON<T>> {
     // (undocumented)
     [Symbol.iterator](): Iterator<T>;
     // (undocumented)
-    apply<U>(mapper: Value<Mapper<T, U>>): Value<U>;
-    // (undocumented)
     equals(value: unknown): value is this;
     // (undocumented)
     flatMap<U>(mapper: Mapper<T, Value<U>>): Value<U>;
     // (undocumented)
-    flatten<T>(this: Value<Value<T>>): Value<T>;
-    // (undocumented)
     includes(value: T): boolean;
     // (undocumented)
     map<U>(mapper: Mapper<T, U>): Value<U>;
diff --git a/docs/review/api/alfa-trampoline.api.md b/docs/review/api/alfa-trampoline.api.md
index b43d9b4bd7..be69c41801 100644
--- a/docs/review/api/alfa-trampoline.api.md
+++ b/docs/review/api/alfa-trampoline.api.md
@@ -15,7 +15,7 @@ import { Reducer } from '@siteimprove/alfa-reducer';
 import { Thunk } from '@siteimprove/alfa-thunk';
 
 // @public (undocumented)
-export abstract class Trampoline<T> implements Functor<T>, Applicative<T>, Monad<T>, Foldable<T>, Iterable_2<T> {
+export abstract class Trampoline<T> implements Functor<T>, Monad<T>, Foldable<T>, Applicative<T>, Iterable_2<T> {
     // (undocumented)
     [Symbol.iterator](): Iterator<T>;
     // (undocumented)
@@ -23,8 +23,6 @@ export abstract class Trampoline<T> implements Functor<T>, Applicative<T>, Monad
     // (undocumented)
     abstract flatMap<U>(mapper: Mapper<T, Trampoline<U>>): Trampoline<U>;
     // (undocumented)
-    flatten<T>(this: Trampoline<Trampoline<T>>): Trampoline<T>;
-    // (undocumented)
     abstract isDone(): boolean;
     // (undocumented)
     abstract isSuspended(): boolean;
@@ -62,6 +60,7 @@ export namespace Trampoline {
     export function traverse<T, U>(values: Iterable_2<T>, mapper: Mapper<T, Trampoline<U>, [index: number]>): Trampoline<Iterable_2<U>>;
 }
 
+
 // (No @packageDocumentation comment for this package)
 
 ```
diff --git a/package.json b/package.json
index 89e33fc923..d4eeada0e8 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
   },
   "bugs": "https://github.com/siteimprove/alfa/issues",
   "scripts": {
-    "build": "node --max-old-space-size=4096 scripts/build.js --pretty",
+    "build": "node scripts/build.js --pretty",
     "clean": "node scripts/clean.js --pretty",
     "test": "node scripts/test.js --pretty",
     "watch": "node scripts/watch.js --pretty",
@@ -30,7 +30,7 @@
     "execa": "^5.1.1",
     "minimist": "^1.2.5",
     "prettier": "^2.3.1",
-    "typescript": "^4.3.5"
+    "typescript": "^4.3.2"
   },
   "resolutions": {
     "@microsoft/api-documenter": "patch:@microsoft/api-documenter@7.12.7#.yarn/patches/api-documenter.patch"
diff --git a/packages/alfa-act/package.json b/packages/alfa-act/package.json
index 95aa76370c..04dd5b4d3f 100644
--- a/packages/alfa-act/package.json
+++ b/packages/alfa-act/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-act",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for implementing rules specified in the ACT Rules Format",
   "repository": {
@@ -18,27 +18,26 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0",
-    "@siteimprove/alfa-earl": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-future": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-list": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-monad": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-performance": "workspace:^0.20.0",
-    "@siteimprove/alfa-record": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-sarif": "workspace:^0.20.0",
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0",
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0",
-    "@siteimprove/alfa-trilean": "workspace:^0.20.0"
+    "@siteimprove/alfa-earl": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-future": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-list": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-monad": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-performance": "workspace:^0.19.0",
+    "@siteimprove/alfa-record": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-sarif": "workspace:^0.19.0",
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0",
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0",
+    "@siteimprove/alfa-trilean": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-act/src/question.ts b/packages/alfa-act/src/question.ts
index 38373dadaa..1217936121 100644
--- a/packages/alfa-act/src/question.ts
+++ b/packages/alfa-act/src/question.ts
@@ -1,4 +1,3 @@
-import { Applicative } from "@siteimprove/alfa-applicative";
 import { Functor } from "@siteimprove/alfa-functor";
 import { Serializable } from "@siteimprove/alfa-json";
 import { Mapper } from "@siteimprove/alfa-mapper";
@@ -10,12 +9,7 @@ import * as json from "@siteimprove/alfa-json";
  * @public
  */
 export class Question<Q, S, A, T = A>
-  implements
-    Functor<T>,
-    Applicative<T>,
-    Monad<T>,
-    Serializable<Question.JSON<Q, S>>
-{
+  implements Functor<T>, Monad<T>, Serializable<Question.JSON<Q, S>> {
   public static of<Q, A, S>(
     uri: string,
     type: Q,
@@ -71,12 +65,6 @@ export class Question<Q, S, A, T = A>
     );
   }
 
-  public apply<U>(
-    mapper: Question<Q, S, A, Mapper<T, U>>
-  ): Question<Q, S, A, U> {
-    return mapper.flatMap((mapper) => this.map(mapper));
-  }
-
   public flatMap<U>(
     mapper: Mapper<T, Question<Q, S, A, U>>
   ): Question<Q, S, A, U> {
@@ -89,12 +77,6 @@ export class Question<Q, S, A, T = A>
     );
   }
 
-  public flatten<Q, S, A, T>(
-    this: Question<Q, S, A, Question<Q, S, A, T>>
-  ): Question<Q, S, A, T> {
-    return this.flatMap((question) => question);
-  }
-
   public answer(answer: A): T {
     return this._quester(answer);
   }
diff --git a/packages/alfa-act/tsconfig.json b/packages/alfa-act/tsconfig.json
index e9b526c534..52a0d64481 100644
--- a/packages/alfa-act/tsconfig.json
+++ b/packages/alfa-act/tsconfig.json
@@ -15,9 +15,6 @@
     "src/tag.ts"
   ],
   "references": [
-    {
-      "path": "../alfa-applicative"
-    },
     {
       "path": "../alfa-earl"
     },
diff --git a/packages/alfa-affine/package.json b/packages/alfa-affine/package.json
index 6343880d71..05cd460ed6 100644
--- a/packages/alfa-affine/package.json
+++ b/packages/alfa-affine/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-affine",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with affine transformations",
   "repository": {
@@ -18,13 +18,13 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-math": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-math": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-angular/package.json b/packages/alfa-angular/package.json
index e2e962bf1e..b35cbb1e38 100644
--- a/packages/alfa-angular/package.json
+++ b/packages/alfa-angular/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-angular",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Integrations and utilities for the Angular application framework",
   "repository": {
@@ -19,16 +19,16 @@
   ],
   "dependencies": {
     "@angular/core": "^11.0.0",
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "rxjs": "^7.1.0",
     "zone.js": "^0.11.4"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-applicative/package.json b/packages/alfa-applicative/package.json
index dec7745c17..d487a3fb10 100644
--- a/packages/alfa-applicative/package.json
+++ b/packages/alfa-applicative/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-applicative",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling applicative functors",
   "repository": {
@@ -18,11 +18,10 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-applicative/src/applicative.ts b/packages/alfa-applicative/src/applicative.ts
index 46be90f618..88c1bb7d98 100644
--- a/packages/alfa-applicative/src/applicative.ts
+++ b/packages/alfa-applicative/src/applicative.ts
@@ -1,10 +1,8 @@
-import { Functor } from "@siteimprove/alfa-functor";
 import { Mapper } from "@siteimprove/alfa-mapper";
 
 /**
  * @public
  */
-export interface Applicative<T> extends Functor<T> {
-  map<U>(mapper: Mapper<T, U>): Applicative<U>;
+export interface Applicative<T> {
   apply<U>(mapper: Applicative<Mapper<T, U>>): Applicative<U>;
 }
diff --git a/packages/alfa-applicative/tsconfig.json b/packages/alfa-applicative/tsconfig.json
index ba326f5d13..1e33dfa325 100644
--- a/packages/alfa-applicative/tsconfig.json
+++ b/packages/alfa-applicative/tsconfig.json
@@ -3,9 +3,6 @@
   "extends": "../tsconfig.json",
   "files": ["src/applicative.ts", "src/index.ts"],
   "references": [
-    {
-      "path": "../alfa-functor"
-    },
     {
       "path": "../alfa-mapper"
     },
diff --git a/packages/alfa-aria/package.json b/packages/alfa-aria/package.json
index 94e573a707..0337a3a402 100644
--- a/packages/alfa-aria/package.json
+++ b/packages/alfa-aria/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-aria",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with ARIA and the accessibility tree",
   "repository": {
@@ -21,31 +21,31 @@
     "generate": "node scripts/attributes.js && node scripts/roles.js"
   },
   "dependencies": {
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-branched": "workspace:^0.20.0",
-    "@siteimprove/alfa-cache": "workspace:^0.20.0",
-    "@siteimprove/alfa-compatibility": "workspace:^0.20.0",
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-graph": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-lazy": "workspace:^0.20.0",
-    "@siteimprove/alfa-map": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0",
-    "@siteimprove/alfa-set": "workspace:^0.20.0",
-    "@siteimprove/alfa-style": "workspace:^0.20.0",
-    "@siteimprove/alfa-table": "workspace:^0.20.0",
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-branched": "workspace:^0.19.0",
+    "@siteimprove/alfa-cache": "workspace:^0.19.0",
+    "@siteimprove/alfa-compatibility": "workspace:^0.19.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-graph": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-lazy": "workspace:^0.19.0",
+    "@siteimprove/alfa-map": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0",
+    "@siteimprove/alfa-set": "workspace:^0.19.0",
+    "@siteimprove/alfa-style": "workspace:^0.19.0",
+    "@siteimprove/alfa-table": "workspace:^0.19.0",
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-aria/src/feature.ts b/packages/alfa-aria/src/feature.ts
index 5405bfb7fe..bd8596bd68 100644
--- a/packages/alfa-aria/src/feature.ts
+++ b/packages/alfa-aria/src/feature.ts
@@ -124,18 +124,19 @@ const nameFromAttribute = (element: Element, ...attributes: Array<string>) => {
   return None;
 };
 
-const nameFromChild =
-  (predicate: Predicate<Element>) =>
-  (element: Element, device: Device, state: Name.State) =>
-    element
-      .children()
-      .filter(isElement)
-      .find(predicate)
-      .flatMap((child) =>
-        Name.fromDescendants(child, device, state.visit(child)).map((name) =>
-          Name.of(name.value, [Name.Source.descendant(element, name)])
-        )
-      );
+const nameFromChild = (predicate: Predicate<Element>) => (
+  element: Element,
+  device: Device,
+  state: Name.State
+) => {
+  for (const child of element.children().filter(isElement).find(predicate)) {
+    return Name.fromDescendants(child, device, state.visit(child)).map((name) =>
+      Name.of(name.value, [Name.Source.descendant(element, name)])
+    );
+  }
+
+  return None;
+};
 
 const ids = Cache.empty<Node, Map<string, Element>>();
 
@@ -146,8 +147,8 @@ const nameFromLabel = (element: Element, device: Device, state: Name.State) => {
 
   const elements = root.inclusiveDescendants().filter(isElement);
 
-  const isFirstReference = element.id.some((id) =>
-    ids
+  for (const id of element.id) {
+    const target = ids
       .get(root, () =>
         Map.from(
           elements
@@ -157,19 +158,21 @@ const nameFromLabel = (element: Element, device: Device, state: Name.State) => {
             .reverse()
         )
       )
-      .get(id)
-      .includes(element)
-  );
+      .get(id);
+
+    if (target.includes(element)) {
+      continue;
+    } else {
+      return None;
+    }
+  }
 
   const references = labels
     .get(root, () => elements.filter(hasName("label")))
     .filter(
       or(
+        (label) => label.descendants().includes(element),
         (label) =>
-          label.attribute("for").isNone() &&
-          label.descendants().includes(element),
-        (label) =>
-          isFirstReference &&
           label
             .attribute("for")
             .some((attribute) => element.id.includes(attribute.value))
@@ -180,7 +183,7 @@ const nameFromLabel = (element: Element, device: Device, state: Name.State) => {
     Name.fromNode(
       element,
       device,
-      state.reference(Option.of(element)).recurse(true).descend(false)
+      state.reference(None).recurse(true).descend(false)
     ).map((name) => [name, element] as const)
   );
 
diff --git a/packages/alfa-aria/src/name.ts b/packages/alfa-aria/src/name.ts
index d85932a0ae..6ce110a9f8 100644
--- a/packages/alfa-aria/src/name.ts
+++ b/packages/alfa-aria/src/name.ts
@@ -142,8 +142,7 @@ export namespace Name {
     }
 
     export class Descendant
-      implements Equatable, Serializable<Descendant.JSON>
-    {
+      implements Equatable, Serializable<Descendant.JSON> {
       public static of(element: Element, name: Name): Descendant {
         return new Descendant(element, name);
       }
@@ -693,7 +692,7 @@ export namespace Name {
         // step produces an empty name.
         if (
           !state.isReferencing &&
-          !role.some((role) => role.isNamedBy("contents"))
+          !role.every((role) => role.isNamedBy("contents"))
         ) {
           return None;
         }
diff --git a/packages/alfa-aria/test/name.spec.tsx b/packages/alfa-aria/test/name.spec.tsx
index 6d16ae4be6..222df4766e 100644
--- a/packages/alfa-aria/test/name.spec.tsx
+++ b/packages/alfa-aria/test/name.spec.tsx
@@ -1599,146 +1599,3 @@ test(`.from() behaves correctly when encountering a descendant that doesn't
     },
   });
 });
-
-test(`.from() does not use implicit <label> elements for naming <input> elements
-      if the <label> element has a non-matching for attribute`, (t) => {
-  const input = <input />;
-
-  <form>
-    <label for="bar">
-      {input}
-      Hello world
-    </label>
-  </form>;
-
-  t.deepEqual(Name.from(input, device).toJSON(), {
-    type: "none",
-  });
-});
-
-test(`.from() correctly assigns names to <input> elements with implicit <label>
-      elements even if IDs are duplicated`, (t) => {
-  const foo = <input id="foo" />;
-  const bar = <input id="foo" />;
-
-  <form>
-    <label>
-      Hello world
-      {foo}
-    </label>
-
-    <label>
-      Lorem ipsum
-      {bar}
-    </label>
-  </form>;
-
-  t.deepEqual(Name.from(foo, device).toJSON(), {
-    type: "some",
-    value: {
-      value: "Hello world",
-      sources: [
-        {
-          type: "ancestor",
-          element: "/form[1]/label[1]",
-          name: {
-            value: "Hello world",
-            sources: [
-              {
-                type: "descendant",
-                element: "/form[1]/label[1]",
-                name: {
-                  value: "Hello world",
-                  sources: [
-                    {
-                      text: "/form[1]/label[1]/text()[1]",
-                      type: "data",
-                    },
-                  ],
-                },
-              },
-            ],
-          },
-        },
-      ],
-    },
-  });
-
-  t.deepEqual(Name.from(bar, device).toJSON(), {
-    type: "some",
-    value: {
-      value: "Lorem ipsum",
-      sources: [
-        {
-          type: "ancestor",
-          element: "/form[1]/label[2]",
-          name: {
-            value: "Lorem ipsum",
-            sources: [
-              {
-                type: "descendant",
-                element: "/form[1]/label[2]",
-                name: {
-                  value: "Lorem ipsum",
-                  sources: [
-                    {
-                      text: "/form[1]/label[2]/text()[1]",
-                      type: "data",
-                    },
-                  ],
-                },
-              },
-            ],
-          },
-        },
-      ],
-    },
-  });
-});
-
-test(`.from() only associates <label> elements with for attributes with the
-      first matching element`, (t) => {
-  const foo = <input id="foo" />;
-  const bar = <input id="foo" />;
-
-  <form>
-    <label for="foo">Hello world</label>
-    {foo}
-    {bar}
-  </form>;
-
-  t.deepEqual(Name.from(foo, device).toJSON(), {
-    type: "some",
-    value: {
-      value: "Hello world",
-      sources: [
-        {
-          type: "reference",
-          attribute: "/form[1]/label[1]/@for",
-          name: {
-            value: "Hello world",
-            sources: [
-              {
-                type: "descendant",
-                element: "/form[1]/label[1]",
-                name: {
-                  value: "Hello world",
-                  sources: [
-                    {
-                      text: "/form[1]/label[1]/text()[1]",
-                      type: "data",
-                    },
-                  ],
-                },
-              },
-            ],
-          },
-        },
-      ],
-    },
-  });
-
-  t.deepEqual(Name.from(bar, device).toJSON(), {
-    type: "none",
-  });
-});
diff --git a/packages/alfa-aria/test/node.spec.tsx b/packages/alfa-aria/test/node.spec.tsx
index 089c4af276..b6186eaa25 100644
--- a/packages/alfa-aria/test/node.spec.tsx
+++ b/packages/alfa-aria/test/node.spec.tsx
@@ -519,71 +519,27 @@ test(`.from() doesn't expose children of elements with roles that designate
 });
 
 test(`.from() correctly sets \`aria-setsize\` and \`aria-posinset\``, (t) => {
-  const items = [
-    <li>First</li>,
-    <li>Second</li>,
-    <li>Third</li>,
-    <li>Fourth</li>,
-  ];
+  const first = <li>First</li>;
+  const second = <li>Second</li>;
+  const third = <li>Third</li>;
+  const fourth = <li>Fourth</li>;
+
+  const _ = (
+    <ul>
+      {first}
+      {second}
+      {third}
+      {fourth}
+    </ul>
+  );
 
-  <ul>{items}</ul>;
+  const items = [first, second, third, fourth];
 
   for (let i = 0; i < items.length; i++) {
     const node = Node.from(items[i], device);
 
-    t.equal(node.attribute("aria-setsize").get().value, `${items.length}`);
+    t.deepEqual(node.attribute("aria-setsize").get().value, `${items.length}`);
 
-    t.equal(node.attribute("aria-posinset").get().value, `${i + 1}`);
+    t.deepEqual(node.attribute("aria-posinset").get().value, `${i + 1}`);
   }
 });
-
-test(`.from() behaves when encountering an element with global properties where
-      the element should not be named by its subtree`, (t) => {
-  const div = (
-    <div aria-hidden="false">
-      <label>
-        Foo <input />
-      </label>
-    </div>
-  );
-
-  t.deepEqual(Node.from(div, device).toJSON(), {
-    type: "element",
-    node: "/div[1]",
-    role: null,
-    name: null,
-    attributes: [
-      {
-        name: "aria-hidden",
-        value: "false",
-      },
-    ],
-    children: [
-      {
-        type: "container",
-        node: "/div[1]/label[1]",
-        children: [
-          {
-            type: "text",
-            node: "/div[1]/label[1]/text()[1]",
-            name: "Foo ",
-            children: [],
-          },
-          {
-            type: "element",
-            node: "/div[1]/label[1]/input[1]",
-            role: "textbox",
-            name: "Foo",
-            attributes: [
-              {
-                name: "aria-checked",
-                value: "false",
-              },
-            ],
-            children: [],
-          },
-        ],
-      },
-    ],
-  });
-});
diff --git a/packages/alfa-array/package.json b/packages/alfa-array/package.json
index 965878a3ce..e8238d5a4d 100644
--- a/packages/alfa-array/package.json
+++ b/packages/alfa-array/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-array",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with arrays",
   "repository": {
@@ -18,21 +18,21 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-clone": "workspace:^0.20.0",
-    "@siteimprove/alfa-comparable": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-clone": "workspace:^0.19.0",
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-array/src/array.ts b/packages/alfa-array/src/array.ts
index 36d4be5282..58b6864d7a 100644
--- a/packages/alfa-array/src/array.ts
+++ b/packages/alfa-array/src/array.ts
@@ -158,10 +158,10 @@ export namespace Array {
   }
 
   export function apply<T, U>(
-    array: ReadonlyArray<T>,
+    iterable: ReadonlyArray<T>,
     mapper: ReadonlyArray<Mapper<T, U>>
   ): Array<U> {
-    return flatMap(mapper, (mapper) => map(array, mapper));
+    return flatMap(iterable, (value) => map(mapper, (mapper) => mapper(value)));
   }
 
   export function filter<T, U extends T>(
@@ -373,10 +373,7 @@ export namespace Array {
     index: number,
     value: T
   ): Array<T> {
-    if (index <= array.length) {
-      array.splice(index, 0, value);
-    }
-
+    array.splice(index, 0, value);
     return array;
   }
 
@@ -450,17 +447,17 @@ export namespace Array {
     return array.sort(comparer);
   }
 
-  export function compare<T extends Comparable<U>, U = T>(
+  export function compare<T extends Comparable<T>>(
     a: ReadonlyArray<T>,
-    b: Iterable<U>
+    b: Iterable<T>
   ): Comparison {
     return compareWith(a, b, compareComparable);
   }
 
-  export function compareWith<T, U = T>(
+  export function compareWith<T>(
     a: ReadonlyArray<T>,
-    b: Iterable<U>,
-    comparer: Comparer<T, U, [index: number]>
+    b: Iterable<T>,
+    comparer: Comparer<T>
   ): Comparison {
     return Iterable.compareWith(a, b, comparer);
   }
diff --git a/packages/alfa-assert/package.json b/packages/alfa-assert/package.json
index edb4560e69..ef7a5906de 100644
--- a/packages/alfa-assert/package.json
+++ b/packages/alfa-assert/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-assert",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Core assertion functions for supported input objects",
   "repository": {
@@ -18,13 +18,13 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-act": "workspace:^0.20.0",
-    "@siteimprove/alfa-future": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0",
+    "@siteimprove/alfa-future": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-bits/package.json b/packages/alfa-bits/package.json
index 60a2c1e0a1..7394f605ad 100644
--- a/packages/alfa-bits/package.json
+++ b/packages/alfa-bits/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-bits",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for doing bit manipulation of 32-bit numbers",
   "repository": {
@@ -18,7 +18,7 @@
     "src/**/*.d.ts"
   ],
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-branched/package.json b/packages/alfa-branched/package.json
index 12595c8a58..937f48fa10 100644
--- a/packages/alfa-branched/package.json
+++ b/packages/alfa-branched/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-branched",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of branched values, which are abstract values that can take on multiple concrete values",
   "repository": {
@@ -18,21 +18,21 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-collection": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-list": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-collection": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-list": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-branched/src/branched.ts b/packages/alfa-branched/src/branched.ts
index 3e92200c22..2fb9150e42 100644
--- a/packages/alfa-branched/src/branched.ts
+++ b/packages/alfa-branched/src/branched.ts
@@ -17,8 +17,7 @@ const { not } = Predicate;
  * @public
  */
 export class Branched<T, B = never>
-  implements Collection<T>, Iterable<[T, Iterable<B>]>
-{
+  implements Collection<T>, Iterable<[T, Iterable<B>]> {
   public static of<T, B = never>(
     value: T,
     ...branches: Array<B>
@@ -73,10 +72,6 @@ export class Branched<T, B = never>
     );
   }
 
-  public apply<U>(mapper: Branched<Mapper<T, U>, B>): Branched<U, B> {
-    return mapper.flatMap((mapper) => this.map(mapper));
-  }
-
   public flatMap<U>(
     mapper: Mapper<T, Branched<U, B>, [Iterable<B>]>
   ): Branched<U, B> {
@@ -100,10 +95,6 @@ export class Branched<T, B = never>
     );
   }
 
-  public flatten<T, B>(this: Branched<Branched<T, B>, B>): Branched<T, B> {
-    return this.flatMap((branched) => branched);
-  }
-
   public reduce<U>(reducer: Reducer<T, U, [Iterable<B>]>, accumulator: U): U {
     return this._values.reduce(
       (accumulator, value) =>
@@ -116,6 +107,10 @@ export class Branched<T, B = never>
     );
   }
 
+  public apply<U>(mapper: Branched<Mapper<T, U>, B>): Branched<U, B> {
+    return this.flatMap((value) => mapper.map((mapper) => mapper(value)));
+  }
+
   public filter<U extends T>(
     refinement: Refinement<T, U, [Iterable<B>]>
   ): Branched<U, B>;
diff --git a/packages/alfa-cache/package.json b/packages/alfa-cache/package.json
index 028159ced0..963eaaebee 100644
--- a/packages/alfa-cache/package.json
+++ b/packages/alfa-cache/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-cache",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "A simple in-memory cache that can be used for various purposes, such as function memoization",
   "repository": {
@@ -18,12 +18,12 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-callback/package.json b/packages/alfa-callback/package.json
index 88ebd9b25c..3039b1905f 100644
--- a/packages/alfa-callback/package.json
+++ b/packages/alfa-callback/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-callback",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling functions that can be passed around and called back with a value once available",
   "repository": {
@@ -18,10 +18,10 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-cascade/package.json b/packages/alfa-cascade/package.json
index 03f7add7cb..24686ad7ff 100644
--- a/packages/alfa-cascade/package.json
+++ b/packages/alfa-cascade/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-cascade",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with the CSS cascade and scalable selector matching",
   "repository": {
@@ -18,21 +18,21 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-cache": "workspace:^0.20.0",
-    "@siteimprove/alfa-comparable": "workspace:^0.20.0",
-    "@siteimprove/alfa-css": "workspace:^0.20.0",
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-media": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-selector": "workspace:^0.20.0"
+    "@siteimprove/alfa-cache": "workspace:^0.19.0",
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0",
+    "@siteimprove/alfa-css": "workspace:^0.19.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-media": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-selector": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-chai/package.json b/packages/alfa-chai/package.json
index 4aeca2d6b3..2636da8c37 100644
--- a/packages/alfa-chai/package.json
+++ b/packages/alfa-chai/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-chai",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Assertion integrations for the Chai assertion library",
   "repository": {
@@ -18,15 +18,15 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-act": "workspace:^0.20.0",
-    "@siteimprove/alfa-assert": "workspace:^0.20.0",
-    "@siteimprove/alfa-future": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
+    "@siteimprove/alfa-act": "workspace:^0.19.0",
+    "@siteimprove/alfa-assert": "workspace:^0.19.0",
+    "@siteimprove/alfa-future": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
     "@types/chai": "^4.1.7",
     "chai": "^4.3.4"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-cheerio/package.json b/packages/alfa-cheerio/package.json
index 85c4fc1ac9..a0ff8bd91d 100644
--- a/packages/alfa-cheerio/package.json
+++ b/packages/alfa-cheerio/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-cheerio",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for translating Cheerio elements into page objects",
   "repository": {
@@ -20,17 +20,17 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "@types/node": "^14.14.37",
     "cheerio": "^1.0.0-rc.10",
     "domhandler": "^4.2.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-cli/package.json b/packages/alfa-cli/package.json
index 4a631caa25..7655be5012 100644
--- a/packages/alfa-cli/package.json
+++ b/packages/alfa-cli/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-cli",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "The tool for all your accessibility needs on the command line",
   "repository": {
@@ -19,31 +19,31 @@
     "bin/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-act": "workspace:^0.20.0",
-    "@siteimprove/alfa-cache": "workspace:^0.20.0",
-    "@siteimprove/alfa-command": "workspace:^0.20.0",
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-formatter": "workspace:^0.20.0",
-    "@siteimprove/alfa-formatter-earl": "workspace:^0.20.0",
-    "@siteimprove/alfa-formatter-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-future": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-interviewer": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-rules": "workspace:^0.20.0",
-    "@siteimprove/alfa-scraper": "workspace:^0.20.0",
-    "@siteimprove/alfa-time": "workspace:^0.20.0",
-    "@siteimprove/alfa-url": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
-    "@siteimprove/alfa-xpath": "workspace:^0.20.0",
+    "@siteimprove/alfa-act": "workspace:^0.19.0",
+    "@siteimprove/alfa-cache": "workspace:^0.19.0",
+    "@siteimprove/alfa-command": "workspace:^0.19.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-formatter": "workspace:^0.19.0",
+    "@siteimprove/alfa-formatter-earl": "workspace:^0.19.0",
+    "@siteimprove/alfa-formatter-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-future": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-interviewer": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-rules": "workspace:^0.19.0",
+    "@siteimprove/alfa-scraper": "workspace:^0.19.0",
+    "@siteimprove/alfa-time": "workspace:^0.19.0",
+    "@siteimprove/alfa-url": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
+    "@siteimprove/alfa-xpath": "workspace:^0.19.0",
     "@types/node": "^14.14.31",
     "enquirer": "^2.3.6"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-clone/package.json b/packages/alfa-clone/package.json
index 5b53281d1c..02df046c14 100644
--- a/packages/alfa-clone/package.json
+++ b/packages/alfa-clone/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-clone",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling clonable structures",
   "repository": {
@@ -18,7 +18,7 @@
     "src/**/*.d.ts"
   ],
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-collection/package.json b/packages/alfa-collection/package.json
index bd070ddf65..6c9f7438a9 100644
--- a/packages/alfa-collection/package.json
+++ b/packages/alfa-collection/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-collection",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling uniform collection structures",
   "repository": {
@@ -18,24 +18,24 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0",
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-comparable": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-foldable": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-monad": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-applicative": "workspace:^0.19.0",
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-foldable": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-monad": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-collection/src/collection.ts b/packages/alfa-collection/src/collection.ts
index 5acffb397a..e27ba1a7e8 100644
--- a/packages/alfa-collection/src/collection.ts
+++ b/packages/alfa-collection/src/collection.ts
@@ -14,24 +14,25 @@ import { Predicate } from "@siteimprove/alfa-predicate";
 import { Reducer } from "@siteimprove/alfa-reducer";
 import { Refinement } from "@siteimprove/alfa-refinement";
 
+const { compareComparable } = Comparable;
+
 /**
  * @public
  */
 export interface Collection<T>
   extends Functor<T>,
-    Applicative<T>,
     Monad<T>,
     Foldable<T>,
+    Applicative<T>,
     Equatable,
     Hashable {
   readonly size: number;
   isEmpty(): this is Collection<never>;
   forEach(callback: Callback<T>): void;
   map<U>(mapper: Mapper<T, U>): Collection<U>;
-  apply<U>(mapper: Collection<Mapper<T, U>>): Collection<U>;
   flatMap<U>(mapper: Mapper<T, Collection<U>>): Collection<U>;
-  flatten<T>(this: Collection<Collection<T>>): Collection<T>;
   reduce<U>(reducer: Reducer<T, U>, accumulator: U): U;
+  apply<U>(mapper: Collection<Mapper<T, U>>): Collection<U>;
   filter<U extends T>(refinement: Refinement<T, U>): Collection<U>;
   filter(predicate: Predicate<T>): Collection<T>;
   reject<U extends T>(refinement: Refinement<T, U>): Collection<Exclude<T, U>>;
@@ -59,10 +60,9 @@ export namespace Collection {
     isEmpty(): this is Keyed<K, never>;
     forEach(callback: Callback<V, void, [key: K]>): void;
     map<U>(mapper: Mapper<V, U, [key: K]>): Keyed<K, U>;
-    apply<U>(mapper: Keyed<K, Mapper<V, U>>): Keyed<K, U>;
     flatMap<U>(mapper: Mapper<V, Keyed<K, U>, [key: K]>): Keyed<K, U>;
-    flatten<K, V>(this: Keyed<K, Keyed<K, V>>): Keyed<K, V>;
     reduce<U>(reducer: Reducer<V, U, [key: K]>, accumulator: U): U;
+    apply<U>(mapper: Keyed<K, Mapper<V, U>>): Keyed<K, U>;
     filter<U extends V>(refinement: Refinement<V, U, [key: K]>): Keyed<K, U>;
     filter(predicate: Predicate<V, [key: K]>): Keyed<K, V>;
     reject<U extends V>(
@@ -101,10 +101,9 @@ export namespace Collection {
     isEmpty(): this is Unkeyed<never>;
     forEach(callback: Callback<T>): void;
     map<U>(mapper: Mapper<T, U>): Unkeyed<U>;
-    apply<U>(mapper: Unkeyed<Mapper<T, U>>): Unkeyed<U>;
     flatMap<U>(mapper: Mapper<T, Unkeyed<U>>): Unkeyed<U>;
-    flatten<T>(this: Unkeyed<Unkeyed<T>>): Unkeyed<T>;
     reduce<U>(reducer: Reducer<T, U>, accumulator: U): U;
+    apply<U>(mapper: Unkeyed<Mapper<T, U>>): Unkeyed<U>;
     filter<U extends T>(refinement: Refinement<T, U>): Unkeyed<U>;
     filter(predicate: Predicate<T>): Unkeyed<T>;
     reject<U extends T>(refinement: Refinement<T, U>): Unkeyed<Exclude<T, U>>;
@@ -135,14 +134,11 @@ export namespace Collection {
   export interface Indexed<T>
     extends Collection<T>,
       Iterable<T>,
-      Comparable<Iterable<T>>,
       Serializable<Indexed.JSON<T>> {
     isEmpty(): this is Indexed<never>;
     forEach(callback: Callback<T, void, [index: number]>): void;
     map<U>(mapper: Mapper<T, U, [index: number]>): Indexed<U>;
-    apply<U>(mapper: Indexed<Mapper<T, U>>): Indexed<U>;
     flatMap<U>(mapper: Mapper<T, Indexed<U>, [index: number]>): Indexed<U>;
-    flatten<T>(this: Indexed<Indexed<T>>): Indexed<T>;
     reduce<U>(reducer: Reducer<T, U, [index: number]>, accumulator: U): U;
     reduceWhile<U>(
       predicate: Predicate<T, [index: number]>,
@@ -154,6 +150,7 @@ export namespace Collection {
       reducer: Reducer<T, U, [index: number]>,
       accumulator: U
     ): U;
+    apply<U>(mapper: Indexed<Mapper<T, U>>): Indexed<U>;
     filter<U extends T>(
       refinement: Refinement<T, U, [index: number]>
     ): Indexed<U>;
@@ -185,15 +182,9 @@ export namespace Collection {
     first(): Option<T>;
     last(): Option<T>;
     take(count: number): Indexed<T>;
-    takeWhile<U extends T>(
-      refinement: Refinement<T, U, [index: number]>
-    ): Indexed<U>;
     takeWhile(predicate: Predicate<T, [index: number]>): Indexed<T>;
     takeUntil(predicate: Predicate<T, [index: number]>): Indexed<T>;
     takeLast(count: number): Indexed<T>;
-    takeLastWhile<U extends T>(
-      refinement: Refinement<T, U, [index: number]>
-    ): Indexed<U>;
     takeLastWhile(predicate: Predicate<T, [index: number]>): Indexed<T>;
     takeLastUntil(predicate: Predicate<T, [index: number]>): Indexed<T>;
     skip(count: number): Indexed<T>;
@@ -209,16 +200,24 @@ export namespace Collection {
     slice(start: number, end?: number): Indexed<T>;
     reverse(): Indexed<T>;
     join(separator: string): string;
-    sort<T extends Comparable<T>>(this: Indexed<T>): Indexed<T>;
     sortWith(comparer: Comparer<T>): Indexed<T>;
-    compare(this: Indexed<Comparable<T>>, iterable: Iterable<T>): Comparison;
-    compareWith<U = T>(
-      iterable: Iterable<U>,
-      comparer: Comparer<T, U, [index: number]>
-    ): Comparison;
+    compareWith(iterable: Iterable<T>, comparer: Comparer<T>): Comparison;
   }
 
   export namespace Indexed {
     export type JSON<T> = Array<Serializable.ToJSON<T>>;
   }
+
+  export function sort<T extends Comparable<T>>(
+    collection: Indexed<T>
+  ): Indexed<T> {
+    return collection.sortWith(compareComparable);
+  }
+
+  export function compare<T extends Comparable<T>>(
+    a: Indexed<T>,
+    b: Iterable<T>
+  ): Comparison {
+    return a.compareWith(b, compareComparable);
+  }
 }
diff --git a/packages/alfa-command/package.json b/packages/alfa-command/package.json
index 73939b719a..3936f4fc4f 100644
--- a/packages/alfa-command/package.json
+++ b/packages/alfa-command/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-command",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for building robust command line interfaces",
   "repository": {
@@ -18,19 +18,19 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-highlight": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-parser": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-highlight": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-parser": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-comparable/package.json b/packages/alfa-comparable/package.json
index c849901d09..58b05bf6ef 100644
--- a/packages/alfa-comparable/package.json
+++ b/packages/alfa-comparable/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-comparable",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling comparable, totally ordered structures",
   "repository": {
@@ -18,10 +18,10 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-comparable/src/comparable.ts b/packages/alfa-comparable/src/comparable.ts
index d5ca3d0e1c..59a680997d 100644
--- a/packages/alfa-comparable/src/comparable.ts
+++ b/packages/alfa-comparable/src/comparable.ts
@@ -2,91 +2,43 @@ import { Refinement } from "@siteimprove/alfa-refinement";
 
 import { Comparison } from "./comparison";
 
-const { isString, isNumber, isBigInt, isBoolean, isFunction, isObject } =
-  Refinement;
+const {
+  isString,
+  isNumber,
+  isBigInt,
+  isBoolean,
+  isFunction,
+  isObject,
+} = Refinement;
 
 /**
- * This interface describes strcutures that define a
- * {@link https://en.wikipedia.org/wiki/Total_order | total order}.
- *
- * @example
- * ```ts
- * class Foo implements Comparable<Foo> {
- *   readonly value: number;
- *
- *  constructor(value: number) {
- *    this.value = value;
- *  }
- *
- *  compare(value: Foo): Comparison {
- *    if (this.value < value.value) {
- *      return Comparison.Less;
- *    }
- *
- *    if (this.value > value.value) {
- *      return Comparison.Greater;
- *    }
- *
- *    return Comparison.Equal;
- *  }
- *}
- * ```
- *
  * @public
  */
 export interface Comparable<T> {
-  /**
-   * Compare a value to this.
-   */
   compare(value: T): Comparison;
 }
 
 /**
- * This namespace provides additional functions for the
- * {@link (Comparable:interface)} interface.
- *
  * @public
  */
 export namespace Comparable {
-  /**
-   * Check if an unknown value implements the {@link (Comparable:interface)}
-   * interface.
-   */
   export function isComparable<T>(value: unknown): value is Comparable<T> {
     return isObject(value) && isFunction(value.compare);
   }
 
-  /**
-   * Compare two strings.
-   */
   export function compare(a: string, b: string): Comparison;
 
-  /**
-   * Compare two numbers.
-   */
   export function compare(a: number, b: number): Comparison;
 
-  /**
-   * Compare two big integers.
-   */
   export function compare(a: bigint, b: bigint): Comparison;
 
-  /**
-   * Compare two booleans.
-   */
   export function compare(a: boolean, b: boolean): Comparison;
 
-  /**
-   * Compare two comparable values.
-   */
-  export function compare<T extends Comparable<U>, U = T>(
-    a: T,
-    b: U
-  ): Comparison;
+  export function compare<T>(a: Comparable<T>, b: T): Comparison;
 
-  export function compare(
-    a: string | number | bigint | boolean | Comparable<unknown>,
-    b: unknown
+  export function compare<T extends unknown>(
+    a: string | number | bigint | boolean | Comparable<T>,
+    b: T
   ): Comparison {
     if (isString(a)) {
       return compareString(a, b as string);
@@ -148,16 +100,10 @@ export namespace Comparable {
    * This should only be used in cases where branch mispredictions caused by the
    * more general {@link (Comparable:namespace).(compare:5)} are undesired.
    */
-  export function compareComparable<T extends Comparable<U>, U = T>(
-    a: T,
-    b: U
-  ): Comparison {
+  export function compareComparable<T>(a: Comparable<T>, b: T): Comparison {
     return a.compare(b);
   }
 
-  /**
-   * Compare two primitive values.
-   */
   function comparePrimitive<T extends string | number | bigint | boolean>(
     a: T,
     b: T
@@ -173,37 +119,18 @@ export namespace Comparable {
     return Comparison.Equal;
   }
 
-  /**
-   * Check if one value is less than another.
-   */
   export function isLessThan<T>(a: Comparable<T>, b: T): boolean {
     return a.compare(b) < 0;
   }
 
-  /**
-   * Check if one value is less than or equal to another.
-   */
   export function isLessThanOrEqual<T>(a: Comparable<T>, b: T): boolean {
     return a.compare(b) <= 0;
   }
 
-  /**
-   * Check if one value is equal to another
-   */
-  export function isEqual<T>(a: Comparable<T>, b: T): boolean {
-    return a.compare(b) === 0;
-  }
-
-  /**
-   * Check if one value is greater than another.
-   */
   export function isGreaterThan<T>(a: Comparable<T>, b: T): boolean {
     return a.compare(b) > 0;
   }
 
-  /**
-   * Check if one value is greater than or equal to another.
-   */
   export function isGreaterThanOrEqual<T>(a: Comparable<T>, b: T): boolean {
     return a.compare(b) >= 0;
   }
diff --git a/packages/alfa-comparable/src/comparer.ts b/packages/alfa-comparable/src/comparer.ts
index 5ecce1fcdf..876cab85db 100644
--- a/packages/alfa-comparable/src/comparer.ts
+++ b/packages/alfa-comparable/src/comparer.ts
@@ -3,8 +3,8 @@ import { Comparison } from "./comparison";
 /**
  * @public
  */
-export type Comparer<T, U = T, A extends Array<unknown> = []> = (
+export type Comparer<T, A extends Array<unknown> = []> = (
   a: T,
-  b: U,
+  b: T,
   ...args: A
 ) => Comparison;
diff --git a/packages/alfa-compatibility/package.json b/packages/alfa-compatibility/package.json
index f919ea1124..b475641415 100644
--- a/packages/alfa-compatibility/package.json
+++ b/packages/alfa-compatibility/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-compatibility",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Funtionality for answering user agent compatibility questions based on MDN compatibility data",
   "repository": {
@@ -21,14 +21,14 @@
     "generate": "node scripts/features.js && node scripts/browsers.js"
   },
   "dependencies": {
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
     "@types/browserslist": "^4.4.0",
     "browserslist": "^4.16.6"
   },
   "devDependencies": {
     "@mdn/browser-compat-data": "^3.1.3",
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-continuation/package.json b/packages/alfa-continuation/package.json
index e2482d2280..7e9bfa7742 100644
--- a/packages/alfa-continuation/package.json
+++ b/packages/alfa-continuation/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-continuation",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with continuations, which are abstract representations of control flow",
   "repository": {
@@ -18,11 +18,11 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-crawler/package.json b/packages/alfa-crawler/package.json
index e18cdc713a..920f64882d 100644
--- a/packages/alfa-crawler/package.json
+++ b/packages/alfa-crawler/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-crawler",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of a simple web crawler capable of producing streams of page objects",
   "repository": {
@@ -18,16 +18,16 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-frontier": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-scraper": "workspace:^0.20.0",
-    "@siteimprove/alfa-url": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-frontier": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-scraper": "workspace:^0.19.0",
+    "@siteimprove/alfa-url": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-css/package.json b/packages/alfa-css/package.json
index 9c07b90870..750ef5af03 100644
--- a/packages/alfa-css/package.json
+++ b/packages/alfa-css/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-css",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Implementations of the core CSS syntax and value types",
   "repository": {
@@ -18,25 +18,25 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-math": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-parser": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-record": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-slice": "workspace:^0.20.0",
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-math": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-parser": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-record": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-slice": "workspace:^0.19.0",
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-css/src/value/length.ts b/packages/alfa-css/src/value/length.ts
index 1f3e754f55..31a1cab0da 100644
--- a/packages/alfa-css/src/value/length.ts
+++ b/packages/alfa-css/src/value/length.ts
@@ -17,8 +17,7 @@ const { map, either } = Parser;
  */
 export class Length<U extends Unit.Length = Unit.Length>
   extends Dimension<"length", Unit.Length, U>
-  implements Convertible<Unit.Length.Absolute>
-{
+  implements Convertible<Unit.Length.Absolute> {
   public static of<U extends Unit.Length>(value: number, unit: U): Length<U> {
     return new Length(value, unit);
   }
@@ -76,7 +75,7 @@ export class Length<U extends Unit.Length = Unit.Length>
     hash.writeString(this._unit);
   }
 
-  public toJSON(): Length.JSON<U> {
+  public toJSON(): Length.JSON {
     return {
       type: "length",
       value: this._value,
@@ -93,9 +92,8 @@ export class Length<U extends Unit.Length = Unit.Length>
  * @public
  */
 export namespace Length {
-  export interface JSON<U extends Unit.Length = Unit.Length>
-    extends Dimension.JSON<"length"> {
-    unit: U;
+  export interface JSON extends Dimension.JSON<"length"> {
+    unit: Unit.Length;
   }
 
   export function isLength(value: unknown): value is Length {
diff --git a/packages/alfa-cypress/package.json b/packages/alfa-cypress/package.json
index d6ec4c2aa2..3337b886c0 100644
--- a/packages/alfa-cypress/package.json
+++ b/packages/alfa-cypress/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-cypress",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Integrations and utilities for the Cypress testing framework",
   "repository": {
@@ -18,19 +18,19 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-act": "workspace:^0.20.0",
-    "@siteimprove/alfa-assert": "workspace:^0.20.0",
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-formatter": "workspace:^0.20.0",
-    "@siteimprove/alfa-formatter-earl": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-act": "workspace:^0.19.0",
+    "@siteimprove/alfa-assert": "workspace:^0.19.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-formatter": "workspace:^0.19.0",
+    "@siteimprove/alfa-formatter-earl": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "cypress": "^7.5.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-device/package.json b/packages/alfa-device/package.json
index c688dae952..6f2e14d9a5 100644
--- a/packages/alfa-device/package.json
+++ b/packages/alfa-device/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-device",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling device parameters, such as viewport dimensions and pixel density",
   "repository": {
@@ -20,14 +20,14 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-map": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-map": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-dom/package.json b/packages/alfa-dom/package.json
index f724afbfef..2a6e7aa1ac 100644
--- a/packages/alfa-dom/package.json
+++ b/packages/alfa-dom/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-dom",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Implementations of the core DOM and CSSOM node types",
   "repository": {
@@ -20,21 +20,21 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-earl": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-lazy": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-sarif": "workspace:^0.20.0",
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0",
-    "@siteimprove/alfa-trampoline": "workspace:^0.20.0"
+    "@siteimprove/alfa-earl": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-lazy": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-sarif": "workspace:^0.19.0",
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0",
+    "@siteimprove/alfa-trampoline": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-dom/src/jsx-runtime.ts b/packages/alfa-dom/src/jsx-runtime.ts
index b0782ca33c..51bf4b0900 100644
--- a/packages/alfa-dom/src/jsx-runtime.ts
+++ b/packages/alfa-dom/src/jsx-runtime.ts
@@ -25,7 +25,7 @@ export function jsx(
  */
 export function jsxs(
   name: string,
-  properties: _jsx.Properties & { children?: _jsx.Children }
+  properties: _jsx.Properties & { children?: Array<_jsx.Child> }
 ): Element {
   const { children, ...rest } = properties;
 
@@ -41,7 +41,7 @@ export function jsxs(
  */
 export function jsxDEV(
   name: string,
-  properties: _jsx.Properties & { children?: _jsx.Child | _jsx.Children }
+  properties: _jsx.Properties & { children?: _jsx.Child | Array<_jsx.Child> }
 ): Element {
   const { children, ...rest } = properties;
 
diff --git a/packages/alfa-dom/src/jsx.ts b/packages/alfa-dom/src/jsx.ts
index d94c2aee0b..cc8ce8a11c 100644
--- a/packages/alfa-dom/src/jsx.ts
+++ b/packages/alfa-dom/src/jsx.ts
@@ -12,7 +12,7 @@ const { entries } = Object;
 export function jsx(
   name: string,
   properties: jsx.Properties | null = null,
-  ...children: jsx.Children
+  ...children: Array<jsx.Child>
 ): Element {
   const attributes: Record<string, string | boolean> = {};
   const style: Record<string, string> = {};
@@ -37,12 +37,7 @@ export function jsx(
     }
   }
 
-  return h(
-    name,
-    attributes,
-    (children as Array<jsx.Child>).flat(Infinity),
-    style
-  );
+  return h(name, attributes, children, style);
 }
 
 /**
@@ -51,13 +46,6 @@ export function jsx(
 export namespace jsx {
   export type Child = Node | string;
 
-  /**
-   * @remarks
-   * This type is declared using the short array syntax (`[]`) to avoid issues
-   * with circular generic references.
-   */
-  export type Children = (Child | Children)[];
-
   export interface Properties {
     [name: string]: unknown;
 
diff --git a/packages/alfa-earl/package.json b/packages/alfa-earl/package.json
index 218f582a31..6fe854d9c5 100644
--- a/packages/alfa-earl/package.json
+++ b/packages/alfa-earl/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-earl",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling EARL serializable structures",
   "repository": {
@@ -18,12 +18,12 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-json-ld": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-json-ld": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-either/package.json b/packages/alfa-either/package.json
index cb673571fd..49317af1b7 100644
--- a/packages/alfa-either/package.json
+++ b/packages/alfa-either/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-either",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling tagged unions for cases where the member types cannot otherwise be distinguished",
   "repository": {
@@ -18,19 +18,18 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-foldable": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-monad": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-foldable": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-monad": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-either/src/either.ts b/packages/alfa-either/src/either.ts
index e262b27eee..ff251cd05b 100644
--- a/packages/alfa-either/src/either.ts
+++ b/packages/alfa-either/src/either.ts
@@ -1,4 +1,3 @@
-import { Applicative } from "@siteimprove/alfa-applicative";
 import { Equatable } from "@siteimprove/alfa-equatable";
 import { Foldable } from "@siteimprove/alfa-foldable";
 import { Functor } from "@siteimprove/alfa-functor";
@@ -16,21 +15,18 @@ import { Right } from "./right";
  * @public
  */
 export interface Either<L, R = L>
-  extends Functor<R>,
-    Applicative<R>,
-    Monad<R>,
-    Foldable<R>,
+  extends Functor<L | R>,
+    Monad<L | R>,
+    Foldable<L | R>,
     Iterable<L | R>,
     Equatable,
     Hashable,
     Serializable<Either.JSON<L, R>> {
   isLeft(): this is Left<L>;
   isRight(): this is Right<R>;
-  map<T>(mapper: Mapper<R, T>): Either<L, T>;
-  apply<T>(mapper: Either<L, Mapper<R, T>>): Either<L, T>;
-  flatMap<T>(mapper: Mapper<R, Either<L, T>>): Either<L, T>;
-  flatten<L, R>(this: Either<L, Either<L, R>>): Either<L, R>;
-  reduce<T>(reducer: Reducer<R, T>, accumulator: T): T;
+  map<T>(mapper: Mapper<L | R, T>): Either<T, T>;
+  flatMap<T>(mapper: Mapper<L | R, Either<T, T>>): Either<T, T>;
+  reduce<T>(reducer: Reducer<L | R, T>, accumulator: T): T;
   either<T>(left: Mapper<L, T>, right: Mapper<R, T>): T;
   get(): L | R;
   left(): Option<L>;
diff --git a/packages/alfa-either/src/left.ts b/packages/alfa-either/src/left.ts
index 275510d752..b4d14625bc 100644
--- a/packages/alfa-either/src/left.ts
+++ b/packages/alfa-either/src/left.ts
@@ -3,6 +3,7 @@ import { Hash } from "@siteimprove/alfa-hash";
 import { Serializable } from "@siteimprove/alfa-json";
 import { Mapper } from "@siteimprove/alfa-mapper";
 import { None, Option } from "@siteimprove/alfa-option";
+import { Reducer } from "@siteimprove/alfa-reducer";
 
 import * as json from "@siteimprove/alfa-json";
 
@@ -31,24 +32,16 @@ export class Left<L> implements Either<L, never> {
     return false;
   }
 
-  public map(): Left<L> {
-    return this;
+  public map<T>(mapper: Mapper<L, T>): Either<T, T> {
+    return new Left(mapper(this._value));
   }
 
-  public apply(): Left<L> {
-    return this;
+  public flatMap<T>(mapper: Mapper<L, Either<T, T>>): Either<T, T> {
+    return mapper(this._value);
   }
 
-  public flatMap(): Left<L> {
-    return this;
-  }
-
-  public flatten<L, R>(this: Either<L, never>): Either<L, R> {
-    return this;
-  }
-
-  public reduce<T>(reducer: unknown, accumulator: T): T {
-    return accumulator;
+  public reduce<T>(reducer: Reducer<L, T>, accumulator: T): T {
+    return reducer(accumulator, this._value);
   }
 
   public either<T>(left: Mapper<L, T>): T {
diff --git a/packages/alfa-either/src/right.ts b/packages/alfa-either/src/right.ts
index af7f031b1c..7a050f6a05 100644
--- a/packages/alfa-either/src/right.ts
+++ b/packages/alfa-either/src/right.ts
@@ -32,22 +32,14 @@ export class Right<R> implements Either<never, R> {
     return true;
   }
 
-  public map<T>(mapper: Mapper<R, T>): Right<T> {
+  public map<T>(mapper: Mapper<R, T>): Either<T, T> {
     return new Right(mapper(this._value));
   }
 
-  public apply<L, T>(mapper: Either<L, Mapper<R, T>>): Either<L, T> {
-    return mapper.map((mapper) => mapper(this._value));
-  }
-
-  public flatMap<L, T>(mapper: Mapper<R, Either<L, T>>): Either<L, T> {
+  public flatMap<T>(mapper: Mapper<R, Either<T, T>>): Either<T, T> {
     return mapper(this._value);
   }
 
-  public flatten<L, R>(this: Right<Either<L, R>>): Either<L, R> {
-    return this._value;
-  }
-
   public reduce<T>(reducer: Reducer<R, T>, accumulator: T): T {
     return reducer(accumulator, this._value);
   }
diff --git a/packages/alfa-either/tsconfig.json b/packages/alfa-either/tsconfig.json
index db2d0c8f6d..3bc864162e 100644
--- a/packages/alfa-either/tsconfig.json
+++ b/packages/alfa-either/tsconfig.json
@@ -3,9 +3,6 @@
   "extends": "../tsconfig.json",
   "files": ["src/either.ts", "src/index.ts", "src/left.ts", "src/right.ts"],
   "references": [
-    {
-      "path": "../alfa-applicative"
-    },
     {
       "path": "../alfa-equatable"
     },
diff --git a/packages/alfa-emitter/package.json b/packages/alfa-emitter/package.json
index 1b9b2e9336..9828a066f7 100644
--- a/packages/alfa-emitter/package.json
+++ b/packages/alfa-emitter/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-emitter",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of a strongly typed and asynchronously iterable event emitter",
   "repository": {
@@ -18,13 +18,13 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-continuation": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-continuation": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-encoding/package.json b/packages/alfa-encoding/package.json
index daa8dc1df6..de1d35800e 100644
--- a/packages/alfa-encoding/package.json
+++ b/packages/alfa-encoding/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-encoding",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Implementations of performant UTF-8 string encoders and decoders",
   "repository": {
@@ -18,7 +18,7 @@
     "src/**/*.d.ts"
   ],
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-enzyme/package.json b/packages/alfa-enzyme/package.json
index 3fff2097db..8ac3350a92 100644
--- a/packages/alfa-enzyme/package.json
+++ b/packages/alfa-enzyme/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-enzyme",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Integrations and utilities for the Enzyme testing library",
   "repository": {
@@ -18,13 +18,13 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-react": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-react": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "@types/enzyme": "^3.10.8",
     "enzyme": "^3.11.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-equatable/package.json b/packages/alfa-equatable/package.json
index e73e3e26f5..5e4d6264fd 100644
--- a/packages/alfa-equatable/package.json
+++ b/packages/alfa-equatable/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-equatable",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling structures with equivalence relations",
   "repository": {
@@ -18,7 +18,7 @@
     "src/**/*.d.ts"
   ],
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-equatable/src/equatable.ts b/packages/alfa-equatable/src/equatable.ts
index 73e7a03493..466b1e68ca 100644
--- a/packages/alfa-equatable/src/equatable.ts
+++ b/packages/alfa-equatable/src/equatable.ts
@@ -1,26 +1,4 @@
 /**
- * This interface describes structures that define an
- * {@link https://en.wikipedia.org/wiki/Equivalence_relation | equivalence relation}.
- *
- * @example
- * ```ts
- * class Foo implements Equatable {
- *   readonly value: number;
- *
- *   constructor(value: number) {
- *     this.value = value;
- *   }
- *
- *   equals(value: Foo): boolean;
- *
- *   equals(value: unknown): value is this;
- *
- *   equals(value: unknown): boolean {
- *     return value instanceof Foo && value.value === this.value;
- *   }
- * }
- * ```
- *
  * @public
  */
 export interface Equatable {
@@ -42,9 +20,6 @@ export interface Equatable {
 }
 
 /**
- * This namespace provides additional types and functions for the
- * {@link (Equatable:interface)} interface.
- *
  * @public
  */
 export namespace Equatable {
diff --git a/packages/alfa-fnv/package.json b/packages/alfa-fnv/package.json
index f1c7ad71cb..395657c5b1 100644
--- a/packages/alfa-fnv/package.json
+++ b/packages/alfa-fnv/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-fnv",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of the Fowler–Noll–Vo non-cryptographic hash function",
   "repository": {
@@ -18,10 +18,10 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-hash": "workspace:^0.20.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-foldable/package.json b/packages/alfa-foldable/package.json
index 6e94ce3749..9593f7457b 100644
--- a/packages/alfa-foldable/package.json
+++ b/packages/alfa-foldable/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-foldable",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling structures that can be folded over",
   "repository": {
@@ -18,10 +18,10 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-formatter-earl/package.json b/packages/alfa-formatter-earl/package.json
index ed1ed138bd..e515d8cd4c 100644
--- a/packages/alfa-formatter-earl/package.json
+++ b/packages/alfa-formatter-earl/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-formatter-earl",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An outcome formatter that outputs EARL",
   "repository": {
@@ -18,11 +18,11 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-earl": "workspace:^0.20.0",
-    "@siteimprove/alfa-formatter": "workspace:^0.20.0"
+    "@siteimprove/alfa-earl": "workspace:^0.19.0",
+    "@siteimprove/alfa-formatter": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-formatter-json/package.json b/packages/alfa-formatter-json/package.json
index 5505470306..808ae37877 100644
--- a/packages/alfa-formatter-json/package.json
+++ b/packages/alfa-formatter-json/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-formatter-json",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An outcome formatter that outputs JSON",
   "repository": {
@@ -18,11 +18,11 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-formatter": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
+    "@siteimprove/alfa-formatter": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-formatter-sarif/package.json b/packages/alfa-formatter-sarif/package.json
index 0b16bb4dcb..43a7811c7e 100644
--- a/packages/alfa-formatter-sarif/package.json
+++ b/packages/alfa-formatter-sarif/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-formatter-sarif",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An outcome formatter that outputs SARIF",
   "repository": {
@@ -18,11 +18,11 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-formatter": "workspace:^0.20.0",
-    "@siteimprove/alfa-sarif": "workspace:^0.20.0"
+    "@siteimprove/alfa-formatter": "workspace:^0.19.0",
+    "@siteimprove/alfa-sarif": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-formatter/package.json b/packages/alfa-formatter/package.json
index 5e804e8c60..5c6994328f 100644
--- a/packages/alfa-formatter/package.json
+++ b/packages/alfa-formatter/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-formatter",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling ACT outcome formatters",
   "repository": {
@@ -18,11 +18,11 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-act": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-frontier/package.json b/packages/alfa-frontier/package.json
index bc698624c7..3dcd013c73 100644
--- a/packages/alfa-frontier/package.json
+++ b/packages/alfa-frontier/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-frontier",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of a simple crawl frontier that can be persisted to disk",
   "repository": {
@@ -18,14 +18,14 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-url": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-url": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-functor/package.json b/packages/alfa-functor/package.json
index 482619970b..9ccf611e70 100644
--- a/packages/alfa-functor/package.json
+++ b/packages/alfa-functor/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-functor",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling functors, which are structures that can be mapped over",
   "repository": {
@@ -18,10 +18,10 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-future/package.json b/packages/alfa-future/package.json
index ce0fbdb85e..cc08543606 100644
--- a/packages/alfa-future/package.json
+++ b/packages/alfa-future/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-future",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of futures, which are a lazy version of promises for dealing with possibly asynchronous control flow",
   "repository": {
@@ -18,19 +18,19 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0",
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-continuation": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-monad": "workspace:^0.20.0",
-    "@siteimprove/alfa-thenable": "workspace:^0.20.0",
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-applicative": "workspace:^0.19.0",
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-continuation": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-monad": "workspace:^0.19.0",
+    "@siteimprove/alfa-thenable": "workspace:^0.19.0",
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-future/src/future.ts b/packages/alfa-future/src/future.ts
index eed08b746d..f374cd8bbb 100644
--- a/packages/alfa-future/src/future.ts
+++ b/packages/alfa-future/src/future.ts
@@ -17,11 +17,10 @@ import { Thunk } from "@siteimprove/alfa-thunk";
 export abstract class Future<T>
   implements
     Functor<T>,
-    Applicative<T>,
     Monad<T>,
+    Applicative<T>,
     Thenable<T>,
-    AsyncIterable<T>
-{
+    AsyncIterable<T> {
   protected abstract step(): Future<T>;
 
   public then(callback: Callback<T>): void {
@@ -62,14 +61,10 @@ export abstract class Future<T>
     return this.flatMap((value) => Now.of(mapper(value)));
   }
 
-  public apply<U>(mapper: Future<Mapper<T, U>>): Future<U> {
-    return mapper.flatMap((mapper) => this.map(mapper));
-  }
-
   public abstract flatMap<U>(mapper: Mapper<T, Future<U>>): Future<U>;
 
-  public flatten<T>(this: Future<Future<T>>): Future<T> {
-    return this.flatMap((future) => future);
+  public apply<U>(mapper: Future<Mapper<T, U>>): Future<U> {
+    return this.flatMap((value) => mapper.map((mapper) => mapper(value)));
   }
 
   public tee(callback: Callback<T>): Future<T> {
diff --git a/packages/alfa-generator/package.json b/packages/alfa-generator/package.json
index 970e083845..798e59e9f7 100644
--- a/packages/alfa-generator/package.json
+++ b/packages/alfa-generator/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-generator",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with generator functions",
   "repository": {
@@ -18,11 +18,11 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-graph/package.json b/packages/alfa-graph/package.json
index 10334edb67..b6c5303ba1 100644
--- a/packages/alfa-graph/package.json
+++ b/packages/alfa-graph/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-graph",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of an immutable, directed graph",
   "repository": {
@@ -18,16 +18,16 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-map": "workspace:^0.20.0",
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0",
-    "@siteimprove/alfa-set": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-map": "workspace:^0.19.0",
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0",
+    "@siteimprove/alfa-set": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-hash/package.json b/packages/alfa-hash/package.json
index e703cb305c..40b42d49ab 100644
--- a/packages/alfa-hash/package.json
+++ b/packages/alfa-hash/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-hash",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling structures that support hashing",
   "repository": {
@@ -18,13 +18,13 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-encoding": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-encoding": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-highlight/package.json b/packages/alfa-highlight/package.json
index aab7225932..3b6b8b1615 100644
--- a/packages/alfa-highlight/package.json
+++ b/packages/alfa-highlight/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-highlight",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with terminal string styling",
   "repository": {
diff --git a/packages/alfa-http/package.json b/packages/alfa-http/package.json
index 4d94d0a1d6..ded3a49dd5 100644
--- a/packages/alfa-http/package.json
+++ b/packages/alfa-http/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-http",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling HTTP primitives",
   "repository": {
@@ -18,18 +18,18 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-earl": "workspace:^0.20.0",
-    "@siteimprove/alfa-encoding": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-map": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-url": "workspace:^0.20.0"
+    "@siteimprove/alfa-earl": "workspace:^0.19.0",
+    "@siteimprove/alfa-encoding": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-map": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-url": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-iana/package.json b/packages/alfa-iana/package.json
index 6058720782..12e275d45f 100644
--- a/packages/alfa-iana/package.json
+++ b/packages/alfa-iana/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-iana",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with the different IANA registries, such as the language subtag registry",
   "repository": {
@@ -21,15 +21,15 @@
     "generate": "node scripts/languages.js"
   },
   "dependencies": {
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-map": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-slice": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-map": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-slice": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-interviewer/package.json b/packages/alfa-interviewer/package.json
index d248d0096f..74e0540a42 100644
--- a/packages/alfa-interviewer/package.json
+++ b/packages/alfa-interviewer/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-interviewer",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling ACT rule interviewers",
   "repository": {
@@ -18,12 +18,12 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-act": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
+    "@siteimprove/alfa-act": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
     "@types/node": "^14.14.31"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-iterable/package.json b/packages/alfa-iterable/package.json
index 144a6239de..7ba84c7246 100644
--- a/packages/alfa-iterable/package.json
+++ b/packages/alfa-iterable/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-iterable",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with structures that support iteration",
   "repository": {
@@ -18,19 +18,19 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-comparable": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-iterable/src/iterable.ts b/packages/alfa-iterable/src/iterable.ts
index 8ec7c6c0c2..48f583ea8f 100644
--- a/packages/alfa-iterable/src/iterable.ts
+++ b/packages/alfa-iterable/src/iterable.ts
@@ -137,7 +137,7 @@ export namespace Iterable {
     iterable: Iterable<T>,
     mapper: Iterable<Mapper<T, U>>
   ): Iterable<U> {
-    return flatMap(mapper, (mapper) => map(iterable, mapper));
+    return flatMap(iterable, (value) => map(mapper, (mapper) => mapper(value)));
   }
 
   export function filter<T, U extends T>(
@@ -471,16 +471,6 @@ export namespace Iterable {
     }
   }
 
-  export function takeWhile<T, U extends T>(
-    iterable: Iterable<T>,
-    refinement: Refinement<T, U, [index: number]>
-  ): Iterable<U>;
-
-  export function takeWhile<T>(
-    iterable: Iterable<T>,
-    predicate: Predicate<T, [index: number]>
-  ): Iterable<T>;
-
   export function* takeWhile<T>(
     iterable: Iterable<T>,
     predicate: Predicate<T, [index: number]>
@@ -524,16 +514,6 @@ export namespace Iterable {
     yield* last;
   }
 
-  export function takeLastWhile<T, U extends T>(
-    iterable: Iterable<T>,
-    refinement: Refinement<T, U, [index: number]>
-  ): Iterable<U>;
-
-  export function takeLastWhile<T>(
-    iterable: Iterable<T>,
-    predicate: Predicate<T, [index: number]>
-  ): Iterable<T>;
-
   export function* takeLastWhile<T>(
     iterable: Iterable<T>,
     predicate: Predicate<T, [index: number]>
@@ -747,23 +727,21 @@ export namespace Iterable {
     yield* [...iterable].sort(comparer);
   }
 
-  export function compare<T extends Comparable<U>, U = T>(
+  export function compare<T extends Comparable<T>>(
     a: Iterable<T>,
-    b: Iterable<U>
+    b: Iterable<T>
   ): Comparison {
     return compareWith(a, b, compareComparable);
   }
 
-  export function compareWith<T, U = T>(
+  export function compareWith<T>(
     a: Iterable<T>,
-    b: Iterable<U>,
-    comparer: Comparer<T, U, [index: number]>
+    b: Iterable<T>,
+    comparer: Comparer<T>
   ): Comparison {
     const itA = iterator(a);
     const itB = iterator(b);
 
-    let index = 0;
-
     while (true) {
       const a = itA.next();
       const b = itB.next();
@@ -776,7 +754,7 @@ export namespace Iterable {
         return Comparison.Greater;
       }
 
-      const result = comparer(a.value, b.value, index++);
+      const result = comparer(a.value, b.value);
 
       if (result !== 0) {
         return result;
diff --git a/packages/alfa-jasmine/package.json b/packages/alfa-jasmine/package.json
index b866f1cf22..e482150de9 100644
--- a/packages/alfa-jasmine/package.json
+++ b/packages/alfa-jasmine/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-jasmine",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Assertion integrations for the Jasmine testing framework",
   "repository": {
@@ -18,16 +18,16 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-act": "workspace:^0.20.0",
-    "@siteimprove/alfa-assert": "workspace:^0.20.0",
-    "@siteimprove/alfa-future": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-act": "workspace:^0.19.0",
+    "@siteimprove/alfa-assert": "workspace:^0.19.0",
+    "@siteimprove/alfa-future": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "@types/jasmine": "^3.3.12",
     "jasmine": "^3.7.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-jest/package.json b/packages/alfa-jest/package.json
index b09b3508f7..0b5b8510d4 100644
--- a/packages/alfa-jest/package.json
+++ b/packages/alfa-jest/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-jest",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Assertion integrations for the Jest testing framework",
   "repository": {
@@ -20,16 +20,16 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-act": "workspace:^0.20.0",
-    "@siteimprove/alfa-assert": "workspace:^0.20.0",
-    "@siteimprove/alfa-future": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-act": "workspace:^0.19.0",
+    "@siteimprove/alfa-assert": "workspace:^0.19.0",
+    "@siteimprove/alfa-future": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "@types/jest": "^26.0.10",
     "jest": "^27.0.4"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-jquery/package.json b/packages/alfa-jquery/package.json
index b512d849e4..a997756e44 100644
--- a/packages/alfa-jquery/package.json
+++ b/packages/alfa-jquery/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-jquery",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for translating jQuery elements into page objects",
   "repository": {
@@ -20,16 +20,16 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "@types/jquery": "^3.3.29",
     "jquery": "^3.6.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-json-ld/package.json b/packages/alfa-json-ld/package.json
index cb22e05890..a79f2144bd 100644
--- a/packages/alfa-json-ld/package.json
+++ b/packages/alfa-json-ld/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-json-ld",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with JSON-LD documents",
   "repository": {
@@ -18,10 +18,10 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-json/package.json b/packages/alfa-json/package.json
index 744bae8766..2475b3cc51 100644
--- a/packages/alfa-json/package.json
+++ b/packages/alfa-json/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-json",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling JSON serializable structures",
   "repository": {
@@ -18,10 +18,10 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-json/src/serializable.ts b/packages/alfa-json/src/serializable.ts
index e28ef3ba26..363d23e60b 100644
--- a/packages/alfa-json/src/serializable.ts
+++ b/packages/alfa-json/src/serializable.ts
@@ -4,8 +4,14 @@ import { JSON } from "./json";
 
 const { keys } = Object;
 const { isArray } = Array;
-const { isFunction, isObject, isString, isNumber, isBoolean, isNull } =
-  Refinement;
+const {
+  isFunction,
+  isObject,
+  isString,
+  isNumber,
+  isBoolean,
+  isNull,
+} = Refinement;
 
 /**
  * @public
diff --git a/packages/alfa-lazy/package.json b/packages/alfa-lazy/package.json
index 6c4c51d75a..ef70fe3f43 100644
--- a/packages/alfa-lazy/package.json
+++ b/packages/alfa-lazy/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-lazy",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of lazy values, which are values whose initialization can be delayed until needed",
   "repository": {
@@ -18,17 +18,16 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-monad": "workspace:^0.20.0",
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0",
-    "@siteimprove/alfa-trampoline": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-monad": "workspace:^0.19.0",
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0",
+    "@siteimprove/alfa-trampoline": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-lazy/src/lazy.ts b/packages/alfa-lazy/src/lazy.ts
index ffea3fb067..9ff83bb69d 100644
--- a/packages/alfa-lazy/src/lazy.ts
+++ b/packages/alfa-lazy/src/lazy.ts
@@ -1,4 +1,3 @@
-import { Applicative } from "@siteimprove/alfa-applicative";
 import { Equatable } from "@siteimprove/alfa-equatable";
 import { Functor } from "@siteimprove/alfa-functor";
 import { Serializable } from "@siteimprove/alfa-json";
@@ -13,12 +12,10 @@ import { Trampoline } from "@siteimprove/alfa-trampoline";
 export class Lazy<T>
   implements
     Functor<T>,
-    Applicative<T>,
     Monad<T>,
     Iterable<T>,
     Equatable,
-    Serializable<Lazy.JSON<T>>
-{
+    Serializable<Lazy.JSON<T>> {
   public static of<T>(thunk: Thunk<T>): Lazy<T> {
     return new Lazy(Trampoline.delay(thunk));
   }
@@ -53,10 +50,6 @@ export class Lazy<T>
     );
   }
 
-  public apply<U>(mapper: Lazy<Mapper<T, U>>): Lazy<U> {
-    return mapper.map((mapper) => mapper(this.force()));
-  }
-
   public flatMap<U>(mapper: Mapper<T, Lazy<U>>): Lazy<U> {
     return new Lazy(
       this._value.flatMap((value) => {
@@ -69,10 +62,6 @@ export class Lazy<T>
     );
   }
 
-  public flatten<T>(this: Lazy<Lazy<T>>): Lazy<T> {
-    return this.flatMap((lazy) => lazy);
-  }
-
   public equals<T>(value: Lazy<T>): boolean;
 
   public equals(value: unknown): value is this;
diff --git a/packages/alfa-lazy/tsconfig.json b/packages/alfa-lazy/tsconfig.json
index d8b18b24d0..65799b6b96 100644
--- a/packages/alfa-lazy/tsconfig.json
+++ b/packages/alfa-lazy/tsconfig.json
@@ -3,9 +3,6 @@
   "extends": "../tsconfig.json",
   "files": ["src/index.ts", "src/lazy.ts", "test/lazy.spec.ts"],
   "references": [
-    {
-      "path": "../alfa-applicative"
-    },
     {
       "path": "../alfa-equatable"
     },
diff --git a/packages/alfa-list/package.json b/packages/alfa-list/package.json
index 99d19de26d..6c4eab135b 100644
--- a/packages/alfa-list/package.json
+++ b/packages/alfa-list/package.json
@@ -2,9 +2,9 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-list",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
-  "description": "An implementation of an immutable list structure, based on a bit-partitioned vector trie",
+  "description": "An implementation of an immutable list structure, based on a persistent vector trie",
   "repository": {
     "type": "git",
     "url": "https://github.com/siteimprove/alfa.git",
@@ -18,26 +18,26 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-bits": "workspace:^0.20.0",
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-collection": "workspace:^0.20.0",
-    "@siteimprove/alfa-comparable": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-map": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-set": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-bits": "workspace:^0.19.0",
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-collection": "workspace:^0.19.0",
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-map": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-set": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-list/src/list.ts b/packages/alfa-list/src/list.ts
index 7249879dbc..36c99d3912 100644
--- a/packages/alfa-list/src/list.ts
+++ b/packages/alfa-list/src/list.ts
@@ -83,10 +83,6 @@ export class List<T> implements Collection.Indexed<T> {
     );
   }
 
-  public apply<U>(mapper: List<Mapper<T, U>>): List<U> {
-    return mapper.flatMap((mapper) => this.map(mapper));
-  }
-
   public flatMap<U>(mapper: Mapper<T, List<U>, [index: number]>): List<U> {
     return this.reduce(
       (list, value, index) => list.concat(mapper(value, index)),
@@ -94,10 +90,6 @@ export class List<T> implements Collection.Indexed<T> {
     );
   }
 
-  public flatten<T>(this: List<List<T>>): List<T> {
-    return this.flatMap((list) => list);
-  }
-
   public reduce<U>(reducer: Reducer<T, U, [index: number]>, accumulator: U): U {
     return Iterable.reduce(this, reducer, accumulator);
   }
@@ -118,6 +110,10 @@ export class List<T> implements Collection.Indexed<T> {
     return Iterable.reduceUntil(this, predicate, reducer, accumulator);
   }
 
+  public apply<U>(mapper: List<Mapper<T, U>>): List<U> {
+    return this.flatMap((value) => mapper.map((mapper) => mapper(value)));
+  }
+
   public filter<U extends T>(
     refinement: Refinement<T, U, [index: number]>
   ): List<U>;
@@ -309,12 +305,6 @@ export class List<T> implements Collection.Indexed<T> {
     return List.from(Iterable.take(this, count));
   }
 
-  public takeWhile<U extends T>(
-    refinement: Refinement<T, U, [index: number]>
-  ): List<U>;
-
-  public takeWhile(predicate: Predicate<T, [index: number]>): List<T>;
-
   public takeWhile(predicate: Predicate<T, [index: number]>): List<T> {
     return List.from(Iterable.takeWhile(this, predicate));
   }
@@ -327,12 +317,6 @@ export class List<T> implements Collection.Indexed<T> {
     return List.from(Iterable.takeLast(this, count));
   }
 
-  public takeLastWhile<U extends T>(
-    refinement: Refinement<T, U, [index: number]>
-  ): List<U>;
-
-  public takeLastWhile(predicate: Predicate<T, [index: number]>): List<T>;
-
   public takeLastWhile(predicate: Predicate<T, [index: number]>): List<T> {
     return List.from(Iterable.takeLastWhile(this, predicate));
   }
@@ -399,22 +383,11 @@ export class List<T> implements Collection.Indexed<T> {
     return Iterable.join(this, separator);
   }
 
-  public sort<T extends Comparable<T>>(this: List<T>): List<T> {
-    return this.sortWith(compareComparable);
-  }
-
   public sortWith(comparer: Comparer<T>): List<T> {
     return List.from(Iterable.sortWith(this, comparer));
   }
 
-  public compare(this: List<Comparable<T>>, iterable: Iterable<T>): Comparison {
-    return this.compareWith(iterable, compareComparable);
-  }
-
-  public compareWith<U = T>(
-    iterable: Iterable<U>,
-    comparer: Comparer<T, U, [index: number]>
-  ): Comparison {
+  public compareWith(iterable: Iterable<T>, comparer: Comparer<T>): Comparison {
     return Iterable.compareWith(this, iterable, comparer);
   }
 
@@ -702,4 +675,15 @@ export namespace List {
       List.empty()
     );
   }
+
+  export function sort<T extends Comparable<T>>(list: List<T>): List<T> {
+    return list.sortWith(compareComparable);
+  }
+
+  export function compare<T extends Comparable<T>>(
+    a: List<T>,
+    b: Iterable<T>
+  ): Comparison {
+    return a.compareWith(b, compareComparable);
+  }
 }
diff --git a/packages/alfa-list/test/list.spec.ts b/packages/alfa-list/test/list.spec.ts
index 0b671bb90f..9bfdf590bd 100644
--- a/packages/alfa-list/test/list.spec.ts
+++ b/packages/alfa-list/test/list.spec.ts
@@ -18,13 +18,6 @@ test("#map() does not overflow for large lists", (t) => {
   t.deepEqual([...list.map((n) => n * 2)], [2, 4, 6, 8]);
 });
 
-test("#apply() applies a list of functions to each value of a list", (t) => {
-  t.deepEqual(
-    [...list.apply(List.from([(n) => n + 1, (n) => n * 2]))],
-    [2, 3, 4, 5, 2, 4, 6, 8]
-  );
-});
-
 test("#flatMap() applies a function to every value of a list and flattens the result", (t) => {
   t.deepEqual(
     [...list.flatMap((n) => List.of(n, n))],
diff --git a/packages/alfa-map/package.json b/packages/alfa-map/package.json
index 585e35817b..cac99b6122 100644
--- a/packages/alfa-map/package.json
+++ b/packages/alfa-map/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-map",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of an immutable map structure, based on a hash array mapped trie",
   "repository": {
@@ -18,24 +18,24 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-bits": "workspace:^0.20.0",
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-collection": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-fnv": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-bits": "workspace:^0.19.0",
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-collection": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-fnv": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-map/src/map.ts b/packages/alfa-map/src/map.ts
index b0d1a06d7b..069519a951 100644
--- a/packages/alfa-map/src/map.ts
+++ b/packages/alfa-map/src/map.ts
@@ -48,57 +48,22 @@ export class Map<K, V> implements Collection.Keyed<K, V> {
     return this._size === 0;
   }
 
-  public forEach(callback: Callback<V, void, [key: K]>): void {
+  public forEach(callback: Callback<V, void, [K]>): void {
     Iterable.forEach(this, ([key, value]) => callback(value, key));
   }
 
-  public map<U>(mapper: Mapper<V, U, [key: K]>): Map<K, U> {
+  public map<U>(mapper: Mapper<V, U, [K]>): Map<K, U> {
     return new Map(this._root.map(mapper), this._size);
   }
 
-  /**
-   * Apply a map of functions to each corresponding value of this map.
-   *
-   * @remarks
-   * Keys without a corresponding function or value are dropped from the
-   * resulting map.
-   *
-   * @example
-   * ```ts
-   * Map.of(["a", 1], ["b", 2])
-   *   .apply(Map.of(["a", (x) => x + 1], ["b", (x) => x * 2]))
-   *   .toArray();
-   * // => [["a", 2], ["b", 4]]
-   * ```
-   */
-  public apply<U>(mapper: Map<K, Mapper<V, U>>): Map<K, U> {
-    return this.collect((value, key) =>
-      mapper.get(key).map((mapper) => mapper(value))
-    );
-  }
-
-  /**
-   * @remarks
-   * As the order of maps is undefined, it is also undefined which keys are
-   * kept when duplicate keys are encountered.
-   */
-  public flatMap<L, U>(mapper: Mapper<V, Map<L, U>, [key: K]>): Map<L, U> {
+  public flatMap<L, U>(mapper: Mapper<V, Map<L, U>, [K]>): Map<L, U> {
     return this.reduce(
       (map, value, key) => map.concat(mapper(value, key)),
       Map.empty<L, U>()
     );
   }
 
-  /**
-   * @remarks
-   * As the order of maps is undefined, it is also undefined which keys are
-   * kept when duplicate keys are encountered.
-   */
-  public flatten<K, V>(this: Map<K, Map<K, V>>): Map<K, V> {
-    return this.flatMap((map) => map);
-  }
-
-  public reduce<R>(reducer: Reducer<V, R, [key: K]>, accumulator: R): R {
+  public reduce<R>(reducer: Reducer<V, R, [K]>, accumulator: R): R {
     return Iterable.reduce(
       this,
       (accumulator, [key, value]) => reducer(accumulator, value, key),
@@ -106,11 +71,15 @@ export class Map<K, V> implements Collection.Keyed<K, V> {
     );
   }
 
-  public filter<U extends V>(refinement: Refinement<V, U, [key: K]>): Map<K, U>;
+  public apply<U>(mapper: Map<K, Mapper<V, U>>): Map<K, U> {
+    return this.flatMap((value) => mapper.map((mapper) => mapper(value)));
+  }
+
+  public filter<U extends V>(refinement: Refinement<V, U, [K]>): Map<K, U>;
 
-  public filter(predicate: Predicate<V, [key: K]>): Map<K, V>;
+  public filter(predicate: Predicate<V, [K]>): Map<K, V>;
 
-  public filter(predicate: Predicate<V, [key: K]>): Map<K, V> {
+  public filter(predicate: Predicate<V, [K]>): Map<K, V> {
     return this.reduce(
       (map, value, key) => (predicate(value, key) ? map.set(key, value) : map),
       Map.empty()
@@ -118,20 +87,20 @@ export class Map<K, V> implements Collection.Keyed<K, V> {
   }
 
   public reject<U extends V>(
-    refinement: Refinement<V, U, [key: K]>
+    refinement: Refinement<V, U, [K]>
   ): Map<K, Exclude<V, U>>;
 
-  public reject(predicate: Predicate<V, [key: K]>): Map<K, V>;
+  public reject(predicate: Predicate<V, [K]>): Map<K, V>;
 
-  public reject(predicate: Predicate<V, [key: K]>): Map<K, V> {
+  public reject(predicate: Predicate<V, [K]>): Map<K, V> {
     return this.filter(not(predicate));
   }
 
-  public find<U extends V>(refinement: Refinement<V, U, [key: K]>): Option<U>;
+  public find<U extends V>(refinement: Refinement<V, U, [K]>): Option<U>;
 
-  public find(predicate: Predicate<V, [key: K]>): Option<V>;
+  public find(predicate: Predicate<V, [K]>): Option<V>;
 
-  public find(predicate: Predicate<V, [key: K]>): Option<V> {
+  public find(predicate: Predicate<V, [K]>): Option<V> {
     return Iterable.find(this, ([key, value]) => predicate(value, key)).map(
       ([, value]) => value
     );
@@ -141,7 +110,7 @@ export class Map<K, V> implements Collection.Keyed<K, V> {
     return Iterable.includes(this.values(), value);
   }
 
-  public collect<U>(mapper: Mapper<V, Option<U>, [key: K]>): Map<K, U> {
+  public collect<U>(mapper: Mapper<V, Option<U>, [K]>): Map<K, U> {
     return Map.from(
       Iterable.collect(this, ([key, value]) =>
         mapper(value, key).map((value) => [key, value])
@@ -149,30 +118,30 @@ export class Map<K, V> implements Collection.Keyed<K, V> {
     );
   }
 
-  public collectFirst<U>(mapper: Mapper<V, Option<U>, [key: K]>): Option<U> {
+  public collectFirst<U>(mapper: Mapper<V, Option<U>, [K]>): Option<U> {
     return Iterable.collectFirst(this, ([key, value]) => mapper(value, key));
   }
 
-  public some(predicate: Predicate<V, [key: K]>): boolean {
+  public some(predicate: Predicate<V, [K]>): boolean {
     return Iterable.some(this, ([key, value]) => predicate(value, key));
   }
 
-  public none(predicate: Predicate<V, [key: K]>): boolean {
+  public none(predicate: Predicate<V, [K]>): boolean {
     return Iterable.none(this, ([key, value]) => predicate(value, key));
   }
 
-  public every(predicate: Predicate<V, [key: K]>): boolean {
+  public every(predicate: Predicate<V, [K]>): boolean {
     return Iterable.every(this, ([key, value]) => predicate(value, key));
   }
 
-  public count(predicate: Predicate<V, [key: K]>): number {
+  public count(predicate: Predicate<V, [K]>): number {
     return Iterable.count(this, ([key, value]) => predicate(value, key));
   }
 
   /**
    * @remarks
    * As the order of maps is undefined, it is also undefined which keys are
-   * kept when duplicate values are encountered.
+   * deleted when duplicate values are encountered.
    */
   public distinct(): Map<K, V> {
     let seen = Map.empty<V, V>();
diff --git a/packages/alfa-map/src/status.ts b/packages/alfa-map/src/status.ts
index 4500aed140..7145684d48 100644
--- a/packages/alfa-map/src/status.ts
+++ b/packages/alfa-map/src/status.ts
@@ -39,7 +39,9 @@ export namespace Status {
     }
   }
 
-  export const { of: created } = Created;
+  export function created<T>(result: T): Created<T> {
+    return Created.of(result);
+  }
 
   export class Updated<T> extends Status<T> {
     public static of<T>(result: T): Updated<T> {
@@ -55,7 +57,9 @@ export namespace Status {
     }
   }
 
-  export const { of: updated } = Updated;
+  export function updated<T>(result: T): Updated<T> {
+    return Updated.of(result);
+  }
 
   export class Deleted<T> extends Status<T> {
     public static of<T>(result: T): Deleted<T> {
@@ -71,7 +75,9 @@ export namespace Status {
     }
   }
 
-  export const { of: deleted } = Deleted;
+  export function deleted<T>(result: T): Deleted<T> {
+    return Deleted.of(result);
+  }
 
   export class Unchanged<T> extends Status<T> {
     public static of<T>(result: T): Unchanged<T> {
@@ -87,5 +93,7 @@ export namespace Status {
     }
   }
 
-  export const { of: unchanged } = Unchanged;
+  export function unchanged<T>(result: T): Unchanged<T> {
+    return Unchanged.of(result);
+  }
 }
diff --git a/packages/alfa-map/test/map.spec.ts b/packages/alfa-map/test/map.spec.ts
index ee60dab39e..2e1d7d7d2d 100644
--- a/packages/alfa-map/test/map.spec.ts
+++ b/packages/alfa-map/test/map.spec.ts
@@ -32,58 +32,6 @@ test("#size returns the size of a map", (t) => {
   t.equal(map.size, 4);
 });
 
-test("#map() applies a function to each value of a map", (t) => {
-  t.deepEqual(
-    [...map.map((x) => x * 2)],
-    [
-      ["baz", 6],
-      ["qux", 8],
-      ["foo", 2],
-      ["bar", 4],
-    ]
-  );
-});
-
-test("#apply() applies a map of functions to each corresponding value of a map", (t) => {
-  t.deepEqual(
-    [
-      ...map.apply(
-        Map.of(
-          ["foo", (x) => x + 1],
-          ["bar", (x) => x * 2],
-          ["baz", (x) => x - 3],
-          ["qux", (x) => x / 4]
-        )
-      ),
-    ],
-    [
-      ["baz", 0],
-      ["qux", 1],
-      ["foo", 2],
-      ["bar", 4],
-    ]
-  );
-});
-
-test("#apply() drops keys with no corresponding function or value", (t) => {
-  t.deepEqual(
-    [...map.apply(Map.of(["foo", (x) => x + 1], ["fez", (x) => x * 2]))],
-    [["foo", 2]]
-  );
-});
-
-test("#flatMap() applies a function to each value of a map and flattens the result", (t) => {
-  t.deepEqual(
-    [...map.flatMap((x) => Map.of([x.toString(), x]))],
-    [
-      ["3", 3],
-      ["4", 4],
-      ["2", 2],
-      ["1", 1],
-    ]
-  );
-});
-
 test("#distinct() removes duplicate values from a map", (t) => {
   t.deepEqual(
     [
diff --git a/packages/alfa-mapper/package.json b/packages/alfa-mapper/package.json
index ad38ebbdd9..f57ff04fc0 100644
--- a/packages/alfa-mapper/package.json
+++ b/packages/alfa-mapper/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-mapper",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling mapper functions, which are functions that map values from one domain into another domain",
   "repository": {
@@ -18,7 +18,7 @@
     "src/**/*.d.ts"
   ],
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-math/package.json b/packages/alfa-math/package.json
index bd40d82af1..6391647b83 100644
--- a/packages/alfa-math/package.json
+++ b/packages/alfa-math/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-math",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with numbers and mathematical structures, such as vectors and matrices",
   "repository": {
@@ -18,7 +18,7 @@
     "src/**/*.d.ts"
   ],
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-media/package.json b/packages/alfa-media/package.json
index 38fb987cd5..680555685a 100644
--- a/packages/alfa-media/package.json
+++ b/packages/alfa-media/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-media",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with CSS media queries",
   "repository": {
@@ -18,19 +18,19 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-css": "workspace:^0.20.0",
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-parser": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-slice": "workspace:^0.20.0"
+    "@siteimprove/alfa-css": "workspace:^0.19.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-parser": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-slice": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-monad/package.json b/packages/alfa-monad/package.json
index e15877bdab..f8e67c3b14 100644
--- a/packages/alfa-monad/package.json
+++ b/packages/alfa-monad/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-monad",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling monads, which are functors that can be mapped to themselves",
   "repository": {
@@ -18,12 +18,10 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-monad/src/monad.ts b/packages/alfa-monad/src/monad.ts
index 6a57d51865..0aff14e544 100644
--- a/packages/alfa-monad/src/monad.ts
+++ b/packages/alfa-monad/src/monad.ts
@@ -1,13 +1,8 @@
-import { Applicative } from "@siteimprove/alfa-applicative";
-import { Functor } from "@siteimprove/alfa-functor";
 import { Mapper } from "@siteimprove/alfa-mapper";
 
 /**
  * @public
  */
-export interface Monad<T> extends Functor<T>, Applicative<T> {
-  map<U>(mapper: Mapper<T, U>): Monad<U>;
-  apply<U>(mapper: Monad<Mapper<T, U>>): Monad<U>;
+export interface Monad<T> {
   flatMap<U>(mapper: Mapper<T, Monad<U>>): Monad<U>;
-  flatten<T>(this: Monad<Monad<T>>): Monad<T>;
 }
diff --git a/packages/alfa-monad/tsconfig.json b/packages/alfa-monad/tsconfig.json
index 37ce9f045a..e761f9b74d 100644
--- a/packages/alfa-monad/tsconfig.json
+++ b/packages/alfa-monad/tsconfig.json
@@ -3,12 +3,6 @@
   "extends": "../tsconfig.json",
   "files": ["src/index.ts", "src/monad.ts"],
   "references": [
-    {
-      "path": "../alfa-applicative"
-    },
-    {
-      "path": "../alfa-functor"
-    },
     {
       "path": "../alfa-mapper"
     },
diff --git a/packages/alfa-network/package.json b/packages/alfa-network/package.json
index e26909ab70..ffbaffd760 100644
--- a/packages/alfa-network/package.json
+++ b/packages/alfa-network/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-network",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of an immutable, directed graph that allows for multiple, unique edges",
   "repository": {
@@ -18,17 +18,17 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-graph": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-map": "workspace:^0.20.0",
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0",
-    "@siteimprove/alfa-set": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-graph": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-map": "workspace:^0.19.0",
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0",
+    "@siteimprove/alfa-set": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-option/package.json b/packages/alfa-option/package.json
index 5c6f7acad9..4810317d5b 100644
--- a/packages/alfa-option/package.json
+++ b/packages/alfa-option/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-option",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of optional values, which are values that may or may not be present",
   "repository": {
@@ -18,22 +18,22 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0",
-    "@siteimprove/alfa-comparable": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-foldable": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-monad": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-applicative": "workspace:^0.19.0",
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-foldable": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-monad": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-option/src/none.ts b/packages/alfa-option/src/none.ts
index fe1e54d5d5..0942958f83 100644
--- a/packages/alfa-option/src/none.ts
+++ b/packages/alfa-option/src/none.ts
@@ -1,4 +1,4 @@
-import { Comparable, Comparison } from "@siteimprove/alfa-comparable";
+import { Comparison } from "@siteimprove/alfa-comparable";
 import { Hash } from "@siteimprove/alfa-hash";
 import { Thunk } from "@siteimprove/alfa-thunk";
 
@@ -7,8 +7,6 @@ import * as json from "@siteimprove/alfa-json";
 import { Option } from "./option";
 import { Some } from "./some";
 
-const { compareComparable } = Comparable;
-
 /**
  * @public
  */
@@ -30,22 +28,18 @@ export const None: None = new (class None {
     return this;
   }
 
-  public apply(): None {
-    return this;
-  }
-
   public flatMap(): None {
     return this;
   }
 
-  public flatten(): None {
-    return this;
-  }
-
   public reduce<U>(reducer: unknown, accumulator: U): U {
     return accumulator;
   }
 
+  public apply(): None {
+    return this;
+  }
+
   public filter(): None {
     return this;
   }
@@ -98,13 +92,6 @@ export const None: None = new (class None {
     return value();
   }
 
-  public compare<T>(
-    this: Option<Comparable<T>>,
-    option: Option<T>
-  ): Comparison {
-    return this.compareWith(option, compareComparable);
-  }
-
   public compareWith<T>(option: Option<T>): Comparison {
     return option.isNone() ? Comparison.Equal : Comparison.Less;
   }
diff --git a/packages/alfa-option/src/option.ts b/packages/alfa-option/src/option.ts
index f7955af49d..51130c6dc9 100644
--- a/packages/alfa-option/src/option.ts
+++ b/packages/alfa-option/src/option.ts
@@ -22,9 +22,9 @@ const { compareComparable } = Comparable;
  */
 export interface Option<T>
   extends Functor<T>,
-    Applicative<T>,
     Monad<T>,
     Foldable<T>,
+    Applicative<T>,
     Iterable<T>,
     Equatable,
     Hashable,
@@ -32,10 +32,9 @@ export interface Option<T>
   isSome(): this is Some<T>;
   isNone(): this is None;
   map<U>(mapper: Mapper<T, U>): Option<U>;
-  apply<U>(mapper: Option<Mapper<T, U>>): Option<U>;
   flatMap<U>(mapper: Mapper<T, Option<U>>): Option<U>;
-  flatten<T>(this: Option<Option<T>>): Option<T>;
   reduce<U>(reducer: Reducer<T, U>, accumulator: U): U;
+  apply<U>(mapper: Option<Mapper<T, U>>): Option<U>;
   filter<U extends T>(refinement: Refinement<T, U>): Option<U>;
   filter(predicate: Predicate<T>): Option<T>;
   reject<U extends T>(refinement: Refinement<T, U>): Option<Exclude<T, U>>;
@@ -51,8 +50,7 @@ export interface Option<T>
   get(): T;
   getOr<U>(value: U): T | U;
   getOrElse<U>(value: Thunk<U>): T | U;
-  compare(this: Option<Comparable<T>>, option: Option<T>): Comparison;
-  compareWith<U = T>(option: Option<U>, comparer: Comparer<T, U>): Comparison;
+  compareWith(option: Option<T>, comparer: Comparer<T>): Comparison;
   toArray(): Array<T>;
   toJSON(): Option.JSON<T>;
 }
@@ -97,7 +95,18 @@ export namespace Option {
     return None;
   }
 
+  export function flatten<T>(option: Option<Option<T>>): Option<T> {
+    return option.flatMap((option) => option);
+  }
+
   export function from<T>(value: T | null | undefined): Option<NonNullable<T>> {
     return value === null || value === undefined ? None : Some.of(value!);
   }
+
+  export function compare<T extends Comparable<T>>(
+    a: Option<T>,
+    b: Option<T>
+  ): Comparison {
+    return a.compareWith(b, compareComparable);
+  }
 }
diff --git a/packages/alfa-option/src/some.ts b/packages/alfa-option/src/some.ts
index 2ae3606623..4afbd2f695 100644
--- a/packages/alfa-option/src/some.ts
+++ b/packages/alfa-option/src/some.ts
@@ -1,4 +1,4 @@
-import { Comparable, Comparison, Comparer } from "@siteimprove/alfa-comparable";
+import { Comparison, Comparer } from "@siteimprove/alfa-comparable";
 import { Equatable } from "@siteimprove/alfa-equatable";
 import { Hash } from "@siteimprove/alfa-hash";
 import { Serializable } from "@siteimprove/alfa-json";
@@ -13,7 +13,6 @@ import { Option } from "./option";
 import { None } from "./none";
 
 const { not, test } = Predicate;
-const { compareComparable } = Comparable;
 
 /**
  * @public
@@ -41,22 +40,18 @@ export class Some<T> implements Option<T> {
     return new Some(mapper(this._value));
   }
 
-  public apply<U>(mapper: Option<Mapper<T, U>>): Option<U> {
-    return mapper.map((mapper) => mapper(this._value));
-  }
-
   public flatMap<U>(mapper: Mapper<T, Option<U>>): Option<U> {
     return mapper(this._value);
   }
 
-  public flatten<T>(this: Some<Option<T>>): Option<T> {
-    return this._value;
-  }
-
   public reduce<U>(reducer: Reducer<T, U>, accumulator: U): U {
     return reducer(accumulator, this._value);
   }
 
+  public apply<U>(mapper: Option<Mapper<T, U>>): Option<U> {
+    return mapper.map((mapper) => mapper(this._value));
+  }
+
   public filter<U extends T>(refinement: Refinement<T, U>): Option<U>;
 
   public filter(predicate: Predicate<T>): Option<T>;
@@ -119,14 +114,7 @@ export class Some<T> implements Option<T> {
     return this._value;
   }
 
-  public compare(this: Option<Comparable<T>>, option: Option<T>): Comparison {
-    return this.compareWith(option, compareComparable);
-  }
-
-  public compareWith<U = T>(
-    option: Option<U>,
-    comparer: Comparer<T, U>
-  ): Comparison {
+  public compareWith(option: Option<T>, comparer: Comparer<T>): Comparison {
     return option.isSome()
       ? comparer(this._value, option._value)
       : Comparison.Greater;
diff --git a/packages/alfa-option/test/option.spec.ts b/packages/alfa-option/test/option.spec.ts
index 11f84a9705..cf6d8dae0b 100644
--- a/packages/alfa-option/test/option.spec.ts
+++ b/packages/alfa-option/test/option.spec.ts
@@ -48,7 +48,3 @@ test("#flatMap() satisfies associativity", (t) => {
     option.flatMap((n) => f(n).flatMap(g))
   );
 });
-
-test("#flatten() unwraps a nested option", (t) => {
-  t.deepEqual(Option.of(Option.of(1)).flatten(), Some.of(1));
-});
diff --git a/packages/alfa-parser/package.json b/packages/alfa-parser/package.json
index 25e1f54452..d3fdff19f9 100644
--- a/packages/alfa-parser/package.json
+++ b/packages/alfa-parser/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-parser",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling parsers and implementations of various parser combinators, which can be used for constructing modular parsers",
   "repository": {
@@ -18,15 +18,15 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-performance/package.json b/packages/alfa-performance/package.json
index 5b1ffd9fab..5297f6cc6d 100644
--- a/packages/alfa-performance/package.json
+++ b/packages/alfa-performance/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-performance",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with performance measurements, inspired by the User Timing specification",
   "repository": {
@@ -18,13 +18,13 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-emitter": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-emitter": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-playwright/package.json b/packages/alfa-playwright/package.json
index 54d1fcffae..ff91313f7d 100644
--- a/packages/alfa-playwright/package.json
+++ b/packages/alfa-playwright/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-playwright",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Integrations and utilities for the Playwright browser automation library",
   "repository": {
@@ -18,16 +18,16 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "@types/node": "^14.14.31",
     "playwright": "^1.12.1"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-predicate/package.json b/packages/alfa-predicate/package.json
index 3a484f6422..5fb4562859 100644
--- a/packages/alfa-predicate/package.json
+++ b/packages/alfa-predicate/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-predicate",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with first-order predicate logic",
   "repository": {
@@ -18,12 +18,12 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-promise/package.json b/packages/alfa-promise/package.json
index 17cdc99f4b..ba685e2bb8 100644
--- a/packages/alfa-promise/package.json
+++ b/packages/alfa-promise/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-promise",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with promises",
   "repository": {
@@ -18,12 +18,12 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-continuation": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-continuation": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-protractor/package.json b/packages/alfa-protractor/package.json
index fdb138bee7..c4ff9e8f8b 100644
--- a/packages/alfa-protractor/package.json
+++ b/packages/alfa-protractor/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-protractor",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Integrations and utilities for the Protractor testing framework",
   "repository": {
@@ -18,14 +18,14 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "protractor": "^7.0.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-puppeteer/package.json b/packages/alfa-puppeteer/package.json
index 5962dc610d..da96ea0b4d 100644
--- a/packages/alfa-puppeteer/package.json
+++ b/packages/alfa-puppeteer/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-puppeteer",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Integrations and utilities for the Puppeteer browser automation library",
   "repository": {
@@ -18,15 +18,15 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "puppeteer": "^10.0.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-react/package.json b/packages/alfa-react/package.json
index 7181192588..64fc42d6e0 100644
--- a/packages/alfa-react/package.json
+++ b/packages/alfa-react/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-react",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Integrations and utilities for the React component framework",
   "repository": {
@@ -18,19 +18,19 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "@types/react": "^17.0.0",
     "@types/react-test-renderer": "^17.0.0",
     "react": "^17.0.2",
     "react-test-renderer": "^17.0.2"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-record/package.json b/packages/alfa-record/package.json
index 37607a997a..1e1d5b4341 100644
--- a/packages/alfa-record/package.json
+++ b/packages/alfa-record/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-record",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of an immutable record structure with fixed keys",
   "repository": {
@@ -18,17 +18,17 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-foldable": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-list": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-foldable": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-list": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-reducer/package.json b/packages/alfa-reducer/package.json
index df344f502a..288e940652 100644
--- a/packages/alfa-reducer/package.json
+++ b/packages/alfa-reducer/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-reducer",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling reducer functions, which are functions that combine an accumulator with a value to form the next accumulator",
   "repository": {
@@ -18,7 +18,7 @@
     "src/**/*.d.ts"
   ],
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-refinement/package.json b/packages/alfa-refinement/package.json
index 0cb55408f9..6d3913c8ce 100644
--- a/packages/alfa-refinement/package.json
+++ b/packages/alfa-refinement/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-refinement",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with first-order type predicates",
   "repository": {
@@ -18,11 +18,11 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-result/package.json b/packages/alfa-result/package.json
index fc738b02d7..340bf40e4b 100644
--- a/packages/alfa-result/package.json
+++ b/packages/alfa-result/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-result",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of result values, which are values that may either be a successful value or an error",
   "repository": {
@@ -18,22 +18,22 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0",
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-foldable": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-monad": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0",
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-applicative": "workspace:^0.19.0",
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-foldable": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-monad": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0",
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-result/src/err.ts b/packages/alfa-result/src/err.ts
index 4b08a07cc9..9e9dfee212 100644
--- a/packages/alfa-result/src/err.ts
+++ b/packages/alfa-result/src/err.ts
@@ -36,7 +36,7 @@ export class Err<E> implements Result<never, E> {
     return true;
   }
 
-  public map(): Err<E> {
+  public map(): this {
     return this;
   }
 
@@ -44,26 +44,22 @@ export class Err<E> implements Result<never, E> {
     return new Err(mapper(this._error));
   }
 
-  public mapOrElse<U>(ok: unknown, err: Mapper<E, U>): U {
+  public mapOrElse<T, U>(ok: Mapper<T, U>, err: Mapper<E, U>): U {
     return err(this._error);
   }
 
-  public apply(): Err<E> {
+  public flatMap(): this {
     return this;
   }
 
-  public flatMap(): Err<E> {
-    return this;
+  public reduce<U>(reducer: unknown, accumulator: U): U {
+    return accumulator;
   }
 
-  public flatten<T, E>(this: Result<never, E>): Result<T, E> {
+  public apply(): this {
     return this;
   }
 
-  public reduce<U>(reducer: unknown, accumulator: U): U {
-    return accumulator;
-  }
-
   public includes(): boolean {
     return false;
   }
@@ -96,11 +92,11 @@ export class Err<E> implements Result<never, E> {
     return test(predicate, this._error);
   }
 
-  public and(): Err<E> {
+  public and(): this {
     return this;
   }
 
-  public andThen(): Err<E> {
+  public andThen(): this {
     return this;
   }
 
diff --git a/packages/alfa-result/src/ok.ts b/packages/alfa-result/src/ok.ts
index 1f260515e9..6b9c620252 100644
--- a/packages/alfa-result/src/ok.ts
+++ b/packages/alfa-result/src/ok.ts
@@ -40,30 +40,26 @@ export class Ok<T> implements Result<T, never> {
     return new Ok(mapper(this._value));
   }
 
-  public mapErr(): Ok<T> {
+  public mapErr(): this {
     return this;
   }
 
-  public mapOrElse<U>(ok: Mapper<T, U>): U {
+  public mapOrElse<E, U>(ok: Mapper<T, U>): U {
     return ok(this._value);
   }
 
-  public apply<E, U>(mapper: Result<Mapper<T, U>, E>): Result<U, E> {
-    return mapper.map((mapper) => mapper(this._value));
-  }
-
   public flatMap<U, F>(mapper: Mapper<T, Result<U, F>>): Result<U, F> {
     return mapper(this._value);
   }
 
-  public flatten<T, E>(this: Ok<Result<T, E>>): Result<T, E> {
-    return this._value;
-  }
-
   public reduce<U>(reducer: Reducer<T, U>, accumulator: U): U {
     return reducer(accumulator, this._value);
   }
 
+  public apply<E, U>(mapper: Result<Mapper<T, U>, E>): Result<U, E> {
+    return mapper.map((mapper) => mapper(this._value));
+  }
+
   public includes(value: T): boolean {
     return Equatable.equals(this._value, value);
   }
@@ -104,11 +100,11 @@ export class Ok<T> implements Result<T, never> {
     return result(this._value);
   }
 
-  public or(): Ok<T> {
+  public or(): this {
     return this;
   }
 
-  public orElse(): Ok<T> {
+  public orElse(): this {
     return this;
   }
 
diff --git a/packages/alfa-result/src/result.ts b/packages/alfa-result/src/result.ts
index 8173535121..b62795a2ce 100644
--- a/packages/alfa-result/src/result.ts
+++ b/packages/alfa-result/src/result.ts
@@ -20,9 +20,9 @@ import { Ok } from "./ok";
  */
 export interface Result<T, E = T>
   extends Functor<T>,
-    Applicative<T>,
     Monad<T>,
     Foldable<T>,
+    Applicative<T>,
     Iterable<T>,
     Equatable,
     Hashable,
@@ -32,10 +32,9 @@ export interface Result<T, E = T>
   map<U>(mapper: Mapper<T, U>): Result<U, E>;
   mapErr<F>(mapper: Mapper<E, F>): Result<T, F>;
   mapOrElse<U>(ok: Mapper<T, U>, err: Mapper<E, U>): U;
-  apply<U>(mapper: Result<Mapper<T, U>, E>): Result<U, E>;
   flatMap<U>(mapper: Mapper<T, Result<U, E>>): Result<U, E>;
-  flatten<T, E>(this: Result<Result<T, E>, E>): Result<T, E>;
   reduce<U>(reducer: Reducer<T, U>, accumulator: U): U;
+  apply<U>(mapper: Result<Mapper<T, U>, E>): Result<U, E>;
   includes(value: T): boolean;
   includesErr(error: E): boolean;
   some(predicate: Predicate<T>): boolean;
diff --git a/packages/alfa-rules/package.json b/packages/alfa-rules/package.json
index fcbab9bd82..5cbe9057f0 100644
--- a/packages/alfa-rules/package.json
+++ b/packages/alfa-rules/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-rules",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Implementations of ACT rules from the Sanshikan repository",
   "repository": {
@@ -18,46 +18,46 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-act": "workspace:^0.20.0",
-    "@siteimprove/alfa-affine": "workspace:^0.20.0",
-    "@siteimprove/alfa-aria": "workspace:^0.20.0",
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-branched": "workspace:^0.20.0",
-    "@siteimprove/alfa-cache": "workspace:^0.20.0",
-    "@siteimprove/alfa-compatibility": "workspace:^0.20.0",
-    "@siteimprove/alfa-css": "workspace:^0.20.0",
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-earl": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-future": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-iana": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-list": "workspace:^0.20.0",
-    "@siteimprove/alfa-map": "workspace:^0.20.0",
-    "@siteimprove/alfa-math": "workspace:^0.20.0",
-    "@siteimprove/alfa-media": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-record": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-sarif": "workspace:^0.20.0",
-    "@siteimprove/alfa-selector": "workspace:^0.20.0",
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0",
-    "@siteimprove/alfa-set": "workspace:^0.20.0",
-    "@siteimprove/alfa-style": "workspace:^0.20.0",
-    "@siteimprove/alfa-table": "workspace:^0.20.0",
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0",
-    "@siteimprove/alfa-trilean": "workspace:^0.20.0",
-    "@siteimprove/alfa-url": "workspace:^0.20.0",
-    "@siteimprove/alfa-wcag": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0",
+    "@siteimprove/alfa-affine": "workspace:^0.19.0",
+    "@siteimprove/alfa-aria": "workspace:^0.19.0",
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-branched": "workspace:^0.19.0",
+    "@siteimprove/alfa-cache": "workspace:^0.19.0",
+    "@siteimprove/alfa-compatibility": "workspace:^0.19.0",
+    "@siteimprove/alfa-css": "workspace:^0.19.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-earl": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-future": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-iana": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-list": "workspace:^0.19.0",
+    "@siteimprove/alfa-map": "workspace:^0.19.0",
+    "@siteimprove/alfa-math": "workspace:^0.19.0",
+    "@siteimprove/alfa-media": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-record": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-sarif": "workspace:^0.19.0",
+    "@siteimprove/alfa-selector": "workspace:^0.19.0",
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0",
+    "@siteimprove/alfa-set": "workspace:^0.19.0",
+    "@siteimprove/alfa-style": "workspace:^0.19.0",
+    "@siteimprove/alfa-table": "workspace:^0.19.0",
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0",
+    "@siteimprove/alfa-trilean": "workspace:^0.19.0",
+    "@siteimprove/alfa-url": "workspace:^0.19.0",
+    "@siteimprove/alfa-wcag": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-rules/src/common/expectation/get-colors.ts b/packages/alfa-rules/src/common/expectation/get-colors.ts
index 1adbdfbd73..3773a6ffe3 100644
--- a/packages/alfa-rules/src/common/expectation/get-colors.ts
+++ b/packages/alfa-rules/src/common/expectation/get-colors.ts
@@ -74,14 +74,6 @@ export function getBackground(
   device: Device = Device.standard(),
   fakeLastOpacity?: number
 ): Option<Array<RGB<Percentage, Percentage>>> {
-  // If the element has a text-shadow, we don't try to guess how it looks and
-  // ask the user for help.
-  if (
-    Style.from(element, device).computed("text-shadow").value.type !== "keyword"
-  ) {
-    return None;
-  }
-
   return getLayers(element, device, fakeLastOpacity).map((layers) =>
     layers.reduce<Array<RGB<Percentage, Percentage>>>(
       (backdrops, layer) =>
diff --git a/packages/alfa-rules/src/rules.ts b/packages/alfa-rules/src/rules.ts
index e2a7de2cfa..a0f6b9702b 100644
--- a/packages/alfa-rules/src/rules.ts
+++ b/packages/alfa-rules/src/rules.ts
@@ -63,6 +63,7 @@ export { default as R66 } from "./sia-r66/rule";
 export { default as R67 } from "./sia-r67/rule";
 export { default as R68 } from "./sia-r68/rule";
 export { default as R69 } from "./sia-r69/rule";
+export { default as R70 } from "./sia-r70/rule";
 export { default as R71 } from "./sia-r71/rule";
 export { default as R72 } from "./sia-r72/rule";
 export { default as R73 } from "./sia-r73/rule";
diff --git a/packages/alfa-rules/src/sia-r62/rule.ts b/packages/alfa-rules/src/sia-r62/rule.ts
index a9e0ed6ec6..3f99452913 100644
--- a/packages/alfa-rules/src/sia-r62/rule.ts
+++ b/packages/alfa-rules/src/sia-r62/rule.ts
@@ -1,19 +1,14 @@
 import { Rule, Diagnostic } from "@siteimprove/alfa-act";
-import { Cache } from "@siteimprove/alfa-cache";
 import { Color } from "@siteimprove/alfa-css";
 import { Device } from "@siteimprove/alfa-device";
 import { Element, Node, Text } from "@siteimprove/alfa-dom";
 import { Equatable } from "@siteimprove/alfa-equatable";
-import { Hash, Hashable } from "@siteimprove/alfa-hash";
 import { Serializable } from "@siteimprove/alfa-json";
 import { Map } from "@siteimprove/alfa-map";
 import { Option, None } from "@siteimprove/alfa-option";
 import { Predicate } from "@siteimprove/alfa-predicate";
-import { Refinement } from "@siteimprove/alfa-refinement";
 import { Err, Ok, Result } from "@siteimprove/alfa-result";
 import { Context } from "@siteimprove/alfa-selector";
-import { Sequence } from "@siteimprove/alfa-sequence";
-import { Set } from "@siteimprove/alfa-set";
 import { Property, Style } from "@siteimprove/alfa-style";
 import { Criterion } from "@siteimprove/alfa-wcag";
 import { Page } from "@siteimprove/alfa-web";
@@ -32,8 +27,7 @@ import {
 
 const { isElement } = Element;
 const { isText } = Text;
-const { or, not, test } = Predicate;
-const { and } = Refinement;
+const { and, or, not, test } = Predicate;
 
 export default Rule.Atomic.of<Page, Element>({
   uri: "https://alfa.siteimprove.com/rules/sia-r62",
@@ -92,80 +86,32 @@ export default Rule.Atomic.of<Page, Element>({
       },
 
       expectations(target) {
-        const nonLinkElements = containers
-          .get(target)
-          .get()
-          .inclusiveDescendants({
-            flattened: true,
-            nested: true,
-          })
-          .filter(and(isElement, hasNonLinkText(device)));
+        const container = containers.get(target).get();
 
-        const linkElements = target
-          // All descendants of the link.
-          .inclusiveDescendants({
-            flattened: true,
-            nested: true,
-          })
-          .filter(isElement)
-          // Plus those ancestors who don't include non-link text.
-          .concat(
-            target
-              .ancestors({
-                flattened: true,
-                nested: true,
-              })
-              .takeWhile(and(isElement, not(hasNonLinkText(device))))
-          );
-
-        const hasDistinguishingStyle = (context?: Context) =>
-          Set.from(
-            linkElements.map((link) =>
-              // If the link element is distinguishable from at least one
-              // non-link element, this is good enough.
-              // Note that ACT rules draft requires the link-element to be
-              // distinguishable from *all* non-link elements in order to be good.
-              nonLinkElements.some((container) =>
-                isDistinguishable(container, device, context)(link)
-              )
-                ? Ok.of(ComputedStyles.from(link, device, context))
-                : Err.of(ComputedStyles.from(link, device, context))
-            )
-          )
-            .toArray()
-            // sort the Ok before the Err, relative order doesn't matter.
-            .sort((a, b) => (b.isOk() ? 1 : -1));
-
-        // The context needs to be set on the *target*, not on its ancestors
-        // or descendants
-        const isDefaultDistinguishable = hasDistinguishingStyle();
-
-        const isHoverDistinguishable = hasDistinguishingStyle(
+        const defaultStyle = isDistinguishable(target, container, device);
+        const hoverStyle = isDistinguishable(
+          target,
+          container,
+          device,
           Context.hover(target)
         );
-
-        const isFocusDistinguishable = hasDistinguishingStyle(
+        const focusStyle = isDistinguishable(
+          target,
+          container,
+          device,
           Context.focus(target)
         );
 
         return {
           1: expectation(
-            // If at least one link element is good, this is enough. The sorting
-            // guarantees it is first in the array.
-            isDefaultDistinguishable[0].isOk() &&
-              isHoverDistinguishable[0].isOk() &&
-              isFocusDistinguishable[0].isOk(),
+            defaultStyle.isOk() && hoverStyle.isOk() && focusStyle.isOk(),
             () =>
-              Outcomes.IsDistinguishable(
-                isDefaultDistinguishable,
-                isHoverDistinguishable,
-                isFocusDistinguishable
-              ),
+              Outcomes.IsDistinguishable(defaultStyle, hoverStyle, focusStyle),
             () =>
               Outcomes.IsNotDistinguishable(
-                isDefaultDistinguishable,
-                isHoverDistinguishable,
-                isFocusDistinguishable
+                defaultStyle,
+                hoverStyle,
+                focusStyle
               )
           ),
         };
@@ -180,95 +126,81 @@ export namespace Outcomes {
   // This would requires changing the expectation since it does not refine
   // and is thus probably not worth the effort.
   export const IsDistinguishable = (
-    defaultStyles: Iterable<Result<ComputedStyles>>,
-    hoverStyles: Iterable<Result<ComputedStyles>>,
-    focusStyles: Iterable<Result<ComputedStyles>>
+    defaultStyle: Result<ComputedStyles>,
+    hoverStyle: Result<ComputedStyles>,
+    focusStyle: Result<ComputedStyles>
   ) =>
     Ok.of(
       DistinguishingStyles.of(
         `The link is distinguishable from the surrounding text`,
-        defaultStyles,
-        hoverStyles,
-        focusStyles
+        defaultStyle,
+        hoverStyle,
+        focusStyle
       )
     );
 
   export const IsNotDistinguishable = (
-    defaultStyles: Iterable<Result<ComputedStyles>>,
-    hoverStyles: Iterable<Result<ComputedStyles>>,
-    focusStyles: Iterable<Result<ComputedStyles>>
+    defaultStyle: Result<ComputedStyles>,
+    hoverStyle: Result<ComputedStyles>,
+    focusStyle: Result<ComputedStyles>
   ) =>
     Err.of(
       DistinguishingStyles.of(
         `The link is not distinguishable from the surrounding text`,
-        defaultStyles,
-        hoverStyles,
-        focusStyles
+        defaultStyle,
+        hoverStyle,
+        focusStyle
       )
     );
 }
 
-const hasNonLinkTextCache = Cache.empty<Element, boolean>();
-
 function hasNonLinkText(device: Device): Predicate<Element> {
   return function hasNonLinkText(element) {
-    return hasNonLinkTextCache.get(element, () => {
-      //  If we are already below a link, escape.
-      if (
-        element
-          .inclusiveAncestors({
-            flattened: true,
-          })
-          .some(
-            and(
-              isElement,
-              hasRole(device, (role) => role.is("link"))
-            )
-          )
-      ) {
-        return false;
-      }
-
-      const children = element.children({
-        flattened: true,
-      });
+    const children = element.children({
+      flattened: true,
+    });
 
-      // If we've found text, we're done.
-      if (children.some(and(isText, isVisible(device)))) {
-        return true;
-      }
+    if (children.some(and(isText, isVisible(device)))) {
+      return true;
+    }
 
-      // Otherwise, go down.
-      return children
-        .filter(isElement)
-        .reject(hasRole(device, (role) => role.is("link")))
-        .some(hasNonLinkText);
-    });
+    return children
+      .filter(isElement)
+      .reject(hasRole(device, (role) => role.is("link")))
+      .some(hasNonLinkText);
   };
 }
 
 function isDistinguishable(
+  target: Element,
   container: Element,
   device: Device,
   context: Context = Context.empty()
-): Predicate<Element> {
-  return or(
-    // Things like text decoration and backgrounds risk blending with the
-    // container element. We therefore need to check if these can be distinguished
-    // from what the container element might itself set.
-    hasDistinguishableTextDecoration(container, device, context),
-    hasDistinguishableBackground(container, device, context),
-
-    hasDistinguishableFontWeight(container, device, context),
-
-    // We consider the mere presence of borders or outlines on the element as
-    // distinguishable features. There's of course a risk of these blending with
-    // other features of the container element, such as its background, but this
-    // should hopefully not happen (too often) in practice. When it does, we
-    // risk false negatives.
-    hasOutline(device, context),
-    hasBorder(device, context)
-  );
+): Result<ComputedStyles> {
+  const style = ComputedStyles.from(target, device, context);
+
+  return test(
+    or(
+      // Things like text decoration and backgrounds risk blending with the
+      // container element. We therefore need to check if these can be distinguished
+      // from what the container element might itself set.
+      hasDistinguishableTextDecoration(container, device, context),
+      hasDistinguishableBackground(container, device, context),
+
+      hasDistinguishableFontWeight(container, device, context),
+
+      // We consider the mere presence of borders or outlines on the element as
+      // distinguishable features. There's of course a risk of these blending with
+      // other features of the container element, such as its background, but this
+      // should hopefully not happen (too often) in practice. When it does, we
+      // risk false negatives.
+      hasOutline(device, context),
+      hasBorder(device, context)
+    ),
+    target
+  )
+    ? Ok.of(style)
+    : Err.of(style);
 }
 
 function hasDistinguishableTextDecoration(
@@ -333,7 +265,7 @@ function hasDistinguishableFontWeight(
 
 type Name = Property.Name | Property.Shorthand.Name;
 
-export class ComputedStyles implements Equatable, Hashable, Serializable {
+export class ComputedStyles implements Equatable, Serializable {
   public static of(
     style: Iterable<readonly [Name, string]> = []
   ): ComputedStyles {
@@ -358,10 +290,6 @@ export class ComputedStyles implements Equatable, Hashable, Serializable {
     return value instanceof ComputedStyles && value._style.equals(this._style);
   }
 
-  public hash(hash: Hash): void {
-    this._style.hash(hash);
-  }
-
   public toJSON(): ComputedStyles.JSON {
     return {
       style: this._style.toJSON(),
@@ -441,9 +369,11 @@ export namespace ComputedStyles {
       "text-decoration-thickness"
     )}`.trim();
 
-    const longhands = (
-      ["background-color", "color", "font-weight"] as const
-    ).map((property) => [property, longhand(property)] as const);
+    const longhands = ([
+      "background-color",
+      "color",
+      "font-weight",
+    ] as const).map((property) => [property, longhand(property)] as const);
 
     return ComputedStyles.of(
       [
@@ -459,44 +389,44 @@ export namespace ComputedStyles {
 export class DistinguishingStyles extends Diagnostic {
   public static of(
     message: string,
-    defaultStyles: Iterable<Result<ComputedStyles>> = Sequence.empty(),
-    hoverStyles: Iterable<Result<ComputedStyles>> = Sequence.empty(),
-    focusStyles: Iterable<Result<ComputedStyles>> = Sequence.empty()
+    defaultStyle: Result<ComputedStyles> = Err.of(ComputedStyles.of([])),
+    hoverStyle: Result<ComputedStyles> = Err.of(ComputedStyles.of([])),
+    focusStyle: Result<ComputedStyles> = Err.of(ComputedStyles.of([]))
   ): DistinguishingStyles {
     return new DistinguishingStyles(
       message,
-      Sequence.from(defaultStyles),
-      Sequence.from(hoverStyles),
-      Sequence.from(focusStyles)
+      defaultStyle,
+      hoverStyle,
+      focusStyle
     );
   }
 
-  private readonly _defaultStyles: Sequence<Result<ComputedStyles>>;
-  private readonly _hoverStyles: Sequence<Result<ComputedStyles>>;
-  private readonly _focusStyles: Sequence<Result<ComputedStyles>>;
+  private readonly _defaultStyle: Result<ComputedStyles>;
+  private readonly _hoverStyle: Result<ComputedStyles>;
+  private readonly _focusStyle: Result<ComputedStyles>;
 
   private constructor(
     message: string,
-    defaultStyles: Sequence<Result<ComputedStyles>>,
-    hoverStyles: Sequence<Result<ComputedStyles>>,
-    focusStyles: Sequence<Result<ComputedStyles>>
+    defaultStyle: Result<ComputedStyles>,
+    hoverStyle: Result<ComputedStyles>,
+    focusStyle: Result<ComputedStyles>
   ) {
     super(message);
-    this._defaultStyles = defaultStyles;
-    this._hoverStyles = hoverStyles;
-    this._focusStyles = focusStyles;
+    this._defaultStyle = defaultStyle;
+    this._hoverStyle = hoverStyle;
+    this._focusStyle = focusStyle;
   }
 
-  public get defaultStyles(): Iterable<Result<ComputedStyles>> {
-    return this._defaultStyles;
+  public get defaultStyle(): Result<ComputedStyles> {
+    return this._defaultStyle;
   }
 
-  public get hoverStyles(): Iterable<Result<ComputedStyles>> {
-    return this._hoverStyles;
+  public get hoverStyle(): Result<ComputedStyles> {
+    return this._hoverStyle;
   }
 
-  public get focusStyles(): Iterable<Result<ComputedStyles>> {
-    return this._focusStyles;
+  public get focusStyle(): Result<ComputedStyles> {
+    return this._focusStyle;
   }
 
   public equals(value: DistinguishingStyles): boolean;
@@ -506,26 +436,26 @@ export class DistinguishingStyles extends Diagnostic {
   public equals(value: unknown): boolean {
     return (
       value instanceof DistinguishingStyles &&
-      value._defaultStyles.equals(this._defaultStyles) &&
-      value._hoverStyles.equals(this._hoverStyles) &&
-      value._focusStyles.equals(this._focusStyles)
+      value._defaultStyle.equals(this._defaultStyle) &&
+      value._hoverStyle.equals(this._hoverStyle) &&
+      value._focusStyle.equals(this._focusStyle)
     );
   }
 
   public toJSON(): DistinguishingStyles.JSON {
     return {
       ...super.toJSON(),
-      defaultStyle: this._defaultStyles.toJSON(),
-      hoverStyle: this._hoverStyles.toJSON(),
-      focusStyle: this._focusStyles.toJSON(),
+      defaultStyle: this._defaultStyle.toJSON(),
+      hoverStyle: this._hoverStyle.toJSON(),
+      focusStyle: this._focusStyle.toJSON(),
     };
   }
 }
 
 export namespace DistinguishingStyles {
   export interface JSON extends Diagnostic.JSON {
-    defaultStyle: Sequence.JSON<Result<ComputedStyles>>;
-    hoverStyle: Sequence.JSON<Result<ComputedStyles>>;
-    focusStyle: Sequence.JSON<Result<ComputedStyles>>;
+    defaultStyle: Result.JSON<ComputedStyles>;
+    hoverStyle: Result.JSON<ComputedStyles>;
+    focusStyle: Result.JSON<ComputedStyles>;
   }
 }
diff --git a/packages/alfa-rules/src/sia-r70/rule.ts b/packages/alfa-rules/src/sia-r70/rule.ts
new file mode 100644
index 0000000000..d56f22be07
--- /dev/null
+++ b/packages/alfa-rules/src/sia-r70/rule.ts
@@ -0,0 +1,137 @@
+import { Rule, Diagnostic } from "@siteimprove/alfa-act";
+import { Document, Element, Namespace } from "@siteimprove/alfa-dom";
+import { Predicate } from "@siteimprove/alfa-predicate";
+import { Err, Ok } from "@siteimprove/alfa-result";
+import { Page } from "@siteimprove/alfa-web";
+import { List } from "@siteimprove/alfa-list";
+import { Iterable } from "@siteimprove/alfa-iterable";
+import { Array } from "@siteimprove/alfa-array";
+
+import { expectation } from "../common/expectation";
+import { hasChild, isRendered, isDocumentElement } from "../common/predicate";
+
+const { isElement, hasName, hasNamespace } = Element;
+const { and, test } = Predicate;
+
+const isDeprecated = hasName(
+  "acronym",
+  "applet",
+  "basefont",
+  "bgsound",
+  "big",
+  "blink",
+  "center",
+  "content",
+  "dir",
+  "font",
+  "frame",
+  "frameset",
+  "hgroup",
+  "image",
+  "keygen",
+  "marquee",
+  "menuitem",
+  "nobr",
+  "noembed",
+  "noframes",
+  "plaintext",
+  "rb",
+  "rtc",
+  "shadow",
+  "spacer",
+  "strike",
+  "tt",
+  "xmp"
+);
+
+export default Rule.Atomic.of<Page, Document>({
+  uri: "https://alfa.siteimprove.com/rules/sia-r70",
+  evaluate({ device, document }) {
+    return {
+      applicability() {
+        return test(hasChild(isDocumentElement), document) ? [document] : [];
+      },
+
+      expectations(target) {
+        const deprecatedElements = target
+          .descendants({ flattened: true, nested: true })
+          .filter(isElement)
+          .filter(
+            and(hasNamespace(Namespace.HTML), isDeprecated, isRendered(device))
+          );
+
+        return {
+          1: expectation(
+            deprecatedElements.isEmpty(),
+            () => Outcomes.HasNoDeprecatedElement,
+            () => Outcomes.HasDeprecatedElements(deprecatedElements)
+          ),
+        };
+      },
+    };
+  },
+});
+
+export namespace Outcomes {
+  export const HasNoDeprecatedElement = Ok.of(
+    Diagnostic.of(`The document doesn't contain any deprecated element`)
+  );
+
+  export const HasDeprecatedElements = (errors: Iterable<Element>) =>
+    Err.of(
+      DeprecatedElements.of(
+        `The document contains deprecated elements: `,
+        errors
+      )
+    );
+}
+
+class DeprecatedElements extends Diagnostic implements Iterable<Element> {
+  public static of(
+    message: string,
+    errors: Iterable<Element> = []
+  ): DeprecatedElements {
+    return new DeprecatedElements(message, Array.from(errors));
+  }
+
+  private _errors: ReadonlyArray<Element>;
+  private constructor(message: string, errors: Array<Element>) {
+    super(message);
+    this._errors = errors;
+  }
+
+  public get errors(): ReadonlyArray<Element> {
+    return this._errors;
+  }
+  public equals(value: DeprecatedElements): boolean;
+  public equals(value: unknown): value is this;
+  public equals(value: unknown): boolean {
+    return (
+      value instanceof DeprecatedElements &&
+      value._message === this._message &&
+      Array.equals(value._errors, this._errors)
+    );
+  }
+
+  public *[Symbol.iterator](): Iterator<Element> {
+    yield* this._errors;
+  }
+  public toJSON(): DeprecatedElements.JSON {
+    return {
+      ...super.toJSON(),
+      errors: this._errors.map((element) => element.path()),
+    };
+  }
+}
+
+namespace DeprecatedElements {
+  export interface JSON extends Diagnostic.JSON {
+    errors: Array<string>;
+  }
+
+  export function isDeprecatedElements(
+    value: unknown
+  ): value is DeprecatedElements {
+    return value instanceof DeprecatedElements;
+  }
+}
diff --git a/packages/alfa-rules/src/sia-r75/rule.ts b/packages/alfa-rules/src/sia-r75/rule.ts
index cfe4be3ff4..9edb03e19d 100644
--- a/packages/alfa-rules/src/sia-r75/rule.ts
+++ b/packages/alfa-rules/src/sia-r75/rule.ts
@@ -1,5 +1,5 @@
 import { Rule, Diagnostic } from "@siteimprove/alfa-act";
-import { Element, Namespace, Text } from "@siteimprove/alfa-dom";
+import { Element, Namespace } from "@siteimprove/alfa-dom";
 import { Predicate } from "@siteimprove/alfa-predicate";
 import { Ok, Err } from "@siteimprove/alfa-result";
 import { Style } from "@siteimprove/alfa-style";
@@ -11,8 +11,7 @@ import { hasTextContent } from "../common/predicate/has-text-content";
 import { isVisible } from "../common/predicate/is-visible";
 
 const { isElement, hasNamespace } = Element;
-const { isText } = Text;
-const { and, or, not } = Predicate;
+const { and } = Predicate;
 
 export default Rule.Atomic.of<Page, Element>({
   uri: "https://alfa.siteimprove.com/rules/sia-r75",
@@ -47,30 +46,13 @@ export default Rule.Atomic.of<Page, Element>({
       },
 
       expectations(target) {
-        const texts = target
-          .descendants({
-            flattened: true,
-            nested: true,
-          })
-          .filter(isText)
-          .collect((text) => text.parent().filter(isElement))
-          .every(
-            or(
-              not((parent) =>
-                Style.from(parent, device).specified("font-size").source.equals(
-                  // Applicability guarantees there is a cascaded value
-                  Style.from(target, device).cascaded("font-size").get().source
-                )
-              ),
-              (parent) =>
-                Style.from(parent, device).computed("font-size").value.value >=
-                9
-            )
-          );
+        const { value: fontSize } = Style.from(target, device).computed(
+          "font-size"
+        );
 
         return {
           1: expectation(
-            texts,
+            fontSize.value >= 9,
             () => Outcomes.IsSufficient,
             () => Outcomes.IsInsufficient
           ),
@@ -82,7 +64,7 @@ export default Rule.Atomic.of<Page, Element>({
 
 export namespace Outcomes {
   export const IsSufficient = Ok.of(
-    Diagnostic.of(`The font size is greater than 9 pixels`)
+    Diagnostic.of(`The font size is not smaller than 9 pixels`)
   );
 
   export const IsInsufficient = Err.of(
diff --git a/packages/alfa-rules/test/sia-r62/rule.spec.tsx b/packages/alfa-rules/test/sia-r62/rule.spec.tsx
index ba5e2027c1..031cce100c 100644
--- a/packages/alfa-rules/test/sia-r62/rule.spec.tsx
+++ b/packages/alfa-rules/test/sia-r62/rule.spec.tsx
@@ -54,11 +54,7 @@ test(`evaluate() passes an <a> element with a <p> parent element with non-link
 
   t.deepEqual(await evaluate(R62, { document }), [
     passed(R62, target, {
-      1: Outcomes.IsDistinguishable(
-        [defaultStyle],
-        [defaultStyle],
-        [focusStyle]
-      ),
+      1: Outcomes.IsDistinguishable(defaultStyle, defaultStyle, focusStyle),
     }),
   ]);
 });
@@ -75,11 +71,7 @@ test(`evaluate() passes an <a> element with a <p> parent element with non-link
 
   t.deepEqual(await evaluate(R62, { document }), [
     passed(R62, target, {
-      1: Outcomes.IsDistinguishable(
-        [defaultStyle],
-        [defaultStyle],
-        [focusStyle]
-      ),
+      1: Outcomes.IsDistinguishable(defaultStyle, defaultStyle, focusStyle),
     }),
   ]);
 });
@@ -102,7 +94,7 @@ test(`evaluate() fails an <a> element that removes the default text decoration
 
   t.deepEqual(await evaluate(R62, { document }), [
     failed(R62, target, {
-      1: Outcomes.IsNotDistinguishable([noStyle], [noStyle], [noStyle]),
+      1: Outcomes.IsNotDistinguishable(noStyle, noStyle, noStyle),
     }),
   ]);
 });
@@ -124,7 +116,7 @@ test(`evaluate() fails an <a> element that removes the default text decoration
 
   t.deepEqual(await evaluate(R62, { document }), [
     failed(R62, target, {
-      1: Outcomes.IsNotDistinguishable([defaultStyle], [noStyle], [focusStyle]),
+      1: Outcomes.IsNotDistinguishable(defaultStyle, noStyle, focusStyle),
     }),
   ]);
 });
@@ -148,11 +140,7 @@ test(`evaluate() fails an <a> element that removes the default text decoration
 
   t.deepEqual(await evaluate(R62, { document }), [
     failed(R62, target, {
-      1: Outcomes.IsNotDistinguishable(
-        [defaultStyle],
-        [defaultStyle],
-        [noStyle]
-      ),
+      1: Outcomes.IsNotDistinguishable(defaultStyle, defaultStyle, noStyle),
     }),
   ]);
 });
@@ -176,7 +164,7 @@ test(`evaluate() fails an <a> element that removes the default text decoration
 
   t.deepEqual(await evaluate(R62, { document }), [
     failed(R62, target, {
-      1: Outcomes.IsNotDistinguishable([defaultStyle], [noStyle], [noStyle]),
+      1: Outcomes.IsNotDistinguishable(defaultStyle, noStyle, noStyle),
     }),
   ]);
 });
@@ -203,7 +191,7 @@ test(`evaluate() fails an <a> element that applies a text decoration only on
 
   t.deepEqual(await evaluate(R62, { document }), [
     failed(R62, target, {
-      1: Outcomes.IsNotDistinguishable([noStyle], [defaultStyle], [noStyle]),
+      1: Outcomes.IsNotDistinguishable(noStyle, defaultStyle, noStyle),
     }),
   ]);
 });
@@ -230,7 +218,7 @@ test(`evaluate() fails an <a> element that applies a text decoration only on
 
   t.deepEqual(await evaluate(R62, { document }), [
     failed(R62, target, {
-      1: Outcomes.IsNotDistinguishable([noStyle], [noStyle], [defaultStyle]),
+      1: Outcomes.IsNotDistinguishable(noStyle, noStyle, defaultStyle),
     }),
   ]);
 });
@@ -257,11 +245,7 @@ test(`evaluate() fails an <a> element that applies a text decoration only on
 
   t.deepEqual(await evaluate(R62, { document }), [
     failed(R62, target, {
-      1: Outcomes.IsNotDistinguishable(
-        [noStyle],
-        [defaultStyle],
-        [defaultStyle]
-      ),
+      1: Outcomes.IsNotDistinguishable(noStyle, defaultStyle, defaultStyle),
     }),
   ]);
 });
@@ -282,7 +266,7 @@ test(`evaluate() passes an applicable <a> element that removes the default text
     ]
   );
 
-  const style = Ok.of(
+  const styles = Ok.of(
     ComputedStyles.of([
       ["border-width", "0px"],
       ["color", "rgb(0% 0% 93.33333%)"],
@@ -292,7 +276,7 @@ test(`evaluate() passes an applicable <a> element that removes the default text
 
   t.deepEqual(await evaluate(R62, { document }), [
     passed(R62, target, {
-      1: Outcomes.IsDistinguishable([style], [style], [style]),
+      1: Outcomes.IsDistinguishable(styles, styles, styles),
     }),
   ]);
 });
@@ -313,7 +297,7 @@ test(`evaluate() passes an applicable <a> element that removes the default text
     ]
   );
 
-  const style = Ok.of(
+  const styles = Ok.of(
     ComputedStyles.of([
       ["border-width", "0px 0px 1px"],
       ["border-style", "none none solid"],
@@ -326,19 +310,17 @@ test(`evaluate() passes an applicable <a> element that removes the default text
   t.deepEqual(await evaluate(R62, { document }), [
     passed(R62, target, {
       1: Outcomes.IsDistinguishable(
-        [style],
-        [style],
-        [
-          Ok.of(
-            ComputedStyles.of([
-              ["color", "rgb(0% 0% 93.33333%)"],
-              ["outline", "auto"],
-              ["border-width", "0px 0px 1px"],
-              ["border-style", "none none solid"],
-              ["border-color", "currentcolor currentcolor rgb(0% 0% 0%)"],
-            ])
-          ),
-        ]
+        styles,
+        styles,
+        Ok.of(
+          ComputedStyles.of([
+            ["color", "rgb(0% 0% 93.33333%)"],
+            ["outline", "auto"],
+            ["border-width", "0px 0px 1px"],
+            ["border-style", "none none solid"],
+            ["border-color", "currentcolor currentcolor rgb(0% 0% 0%)"],
+          ])
+        )
       ),
     }),
   ]);
@@ -360,7 +342,7 @@ test(`evaluate() fails an <a> element that has no distinguishing features and
     ]
   );
 
-  const style = Err.of(
+  const styles = Err.of(
     ComputedStyles.of([
       ["color", "rgb(0% 0% 93.33333%)"],
       ["border-width", "0px 0px 1px"],
@@ -373,19 +355,17 @@ test(`evaluate() fails an <a> element that has no distinguishing features and
   t.deepEqual(await evaluate(R62, { document }), [
     failed(R62, target, {
       1: Outcomes.IsNotDistinguishable(
-        [style],
-        [style],
-        [
-          Ok.of(
-            ComputedStyles.of([
-              ["color", "rgb(0% 0% 93.33333%)"],
-              ["border-width", "0px 0px 1px"],
-              ["border-style", "none none solid"],
-              ["border-color", "currentcolor currentcolor rgb(0% 0% 0% / 0%)"],
-              ["outline", "auto"],
-            ])
-          ),
-        ]
+        styles,
+        styles,
+        Ok.of(
+          ComputedStyles.of([
+            ["color", "rgb(0% 0% 93.33333%)"],
+            ["border-width", "0px 0px 1px"],
+            ["border-style", "none none solid"],
+            ["border-color", "currentcolor currentcolor rgb(0% 0% 0% / 0%)"],
+            ["outline", "auto"],
+          ])
+        )
       ),
     }),
   ]);
@@ -407,7 +387,7 @@ test(`evaluate() fails an <a> element that has no distinguishing features and
     ]
   );
 
-  const style = Err.of(
+  const styles = Err.of(
     ComputedStyles.of([
       ["color", "rgb(0% 0% 93.33333%)"],
       ["border-width", "0px"],
@@ -420,19 +400,17 @@ test(`evaluate() fails an <a> element that has no distinguishing features and
   t.deepEqual(await evaluate(R62, { document }), [
     failed(R62, target, {
       1: Outcomes.IsNotDistinguishable(
-        [style],
-        [style],
-        [
-          Ok.of(
-            ComputedStyles.of([
-              ["color", "rgb(0% 0% 93.33333%)"],
-              ["outline", "auto"],
-              ["border-width", "0px"],
-              ["border-style", "none none solid"],
-              ["border-color", "currentcolor currentcolor rgb(0% 0% 0%)"],
-            ])
-          ),
-        ]
+        styles,
+        styles,
+        Ok.of(
+          ComputedStyles.of([
+            ["color", "rgb(0% 0% 93.33333%)"],
+            ["outline", "auto"],
+            ["border-width", "0px"],
+            ["border-style", "none none solid"],
+            ["border-color", "currentcolor currentcolor rgb(0% 0% 0%)"],
+          ])
+        )
       ),
     }),
   ]);
@@ -454,7 +432,7 @@ test(`evaluate() passes an applicable <a> element that removes the default text
     ]
   );
 
-  const style = Ok.of(
+  const styles = Ok.of(
     ComputedStyles.of([
       ["border-width", "0px"],
       ["color", "rgb(0% 0% 93.33333%)"],
@@ -466,18 +444,16 @@ test(`evaluate() passes an applicable <a> element that removes the default text
   t.deepEqual(await evaluate(R62, { document }), [
     passed(R62, target, {
       1: Outcomes.IsDistinguishable(
-        [style],
-        [style],
-        [
-          Ok.of(
-            ComputedStyles.of([
-              ["border-width", "0px"],
-              ["color", "rgb(0% 0% 93.33333%)"],
-              ["background-color", "rgb(100% 0% 0%)"],
-              ["outline", "auto"],
-            ])
-          ),
-        ]
+        styles,
+        styles,
+        Ok.of(
+          ComputedStyles.of([
+            ["border-width", "0px"],
+            ["color", "rgb(0% 0% 93.33333%)"],
+            ["background-color", "rgb(100% 0% 0%)"],
+            ["outline", "auto"],
+          ])
+        )
       ),
     }),
   ]);
@@ -505,17 +481,15 @@ test(`evaluate() fails an <a> element that has no distinguishing features but is
   t.deepEqual(await evaluate(R62, { document }), [
     failed(R62, target, {
       1: Outcomes.IsNotDistinguishable(
-        [noStyle],
-        [noStyle],
-        [
-          Ok.of(
-            ComputedStyles.of([
-              ["border-width", "0px"],
-              ["color", "rgb(0% 0% 93.33333%)"],
-              ["outline", "auto"],
-            ])
-          ),
-        ]
+        noStyle,
+        noStyle,
+        Ok.of(
+          ComputedStyles.of([
+            ["border-width", "0px"],
+            ["color", "rgb(0% 0% 93.33333%)"],
+            ["outline", "auto"],
+          ])
+        )
       ),
     }),
   ]);
@@ -541,7 +515,7 @@ test(`evaluate() fails an <a> element that has no distinguishing features and
     ]
   );
 
-  const style = Err.of(
+  const styles = Err.of(
     ComputedStyles.of([
       ["border-width", "0px"],
       ["color", "rgb(0% 0% 93.33333%)"],
@@ -553,18 +527,16 @@ test(`evaluate() fails an <a> element that has no distinguishing features and
   t.deepEqual(await evaluate(R62, { document }), [
     failed(R62, target, {
       1: Outcomes.IsNotDistinguishable(
-        [style],
-        [style],
-        [
-          Ok.of(
-            ComputedStyles.of([
-              ["border-width", "0px"],
-              ["color", "rgb(0% 0% 93.33333%)"],
-              ["background-color", "rgb(100% 0% 0%)"],
-              ["outline", "auto"],
-            ])
-          ),
-        ]
+        styles,
+        styles,
+        Ok.of(
+          ComputedStyles.of([
+            ["border-width", "0px"],
+            ["color", "rgb(0% 0% 93.33333%)"],
+            ["background-color", "rgb(100% 0% 0%)"],
+            ["outline", "auto"],
+          ])
+        )
       ),
     }),
   ]);
@@ -616,11 +588,7 @@ test(`evaluate() passes an <a> element with a <div role="paragraph"> parent elem
 
   t.deepEqual(await evaluate(R62, { document }), [
     passed(R62, target, {
-      1: Outcomes.IsDistinguishable(
-        [defaultStyle],
-        [defaultStyle],
-        [focusStyle]
-      ),
+      1: Outcomes.IsDistinguishable(defaultStyle, defaultStyle, focusStyle),
     }),
   ]);
 });
@@ -657,83 +625,7 @@ test(`evaluate() passes a link whose bolder than surrounding text`, async (t) =>
     ]
   );
 
-  const style = Ok.of(
-    ComputedStyles.of([
-      ["border-width", "0px"],
-      ["color", "rgb(0% 0% 93.33333%)"],
-      ["font-weight", "700"],
-      ["outline", "0px"],
-    ])
-  );
-
-  t.deepEqual(await evaluate(R62, { document }), [
-    passed(R62, target, {
-      1: Outcomes.IsDistinguishable(
-        [style],
-        [style],
-        [
-          Ok.of(
-            ComputedStyles.of([
-              ["border-width", "0px"],
-              ["color", "rgb(0% 0% 93.33333%)"],
-              ["font-weight", "700"],
-              ["outline", "auto"],
-            ])
-          ),
-        ]
-      ),
-    }),
-  ]);
-});
-
-test(`evaluates() doesn't break when link text is nested`, async (t) => {
-  // Since text-decoration and focus outline is not inherited, the <span> has
-  // effectively no style other than color.
-  const target = (
-    <a href="#">
-      <span>Link</span>
-    </a>
-  );
-
-  const document = h.document([<p>Hello {target}</p>]);
-
-  t.deepEqual(await evaluate(R62, { document }), [
-    passed(R62, target, {
-      1: Outcomes.IsDistinguishable(
-        [defaultStyle, noStyle],
-        [defaultStyle, noStyle],
-        [focusStyle, noStyle]
-      ),
-    }),
-  ]);
-});
-
-test(`evaluates() accepts decoration on children of links`, async (t) => {
-  // Since text-decoration and focus outline is not inherited, the <span> has
-  // effectively no style other than color.
-  const target = (
-    <a href="#">
-      <span>Link</span>
-    </a>
-  );
-
-  const document = h.document(
-    [<p>Hello {target}</p>],
-    [
-      h.sheet([
-        h.rule.style("a", {
-          textDecoration: "none",
-        }),
-        h.rule.style("a:focus", {
-          textDecoration: "none",
-          outline: "none",
-        }),
-        h.rule.style("span", { fontWeight: "bold" }),
-      ]),
-    ]
-  );
-
-  const style = Ok.of(
+  const styles = Ok.of(
     ComputedStyles.of([
       ["border-width", "0px"],
       ["color", "rgb(0% 0% 93.33333%)"],
@@ -745,83 +637,16 @@ test(`evaluates() accepts decoration on children of links`, async (t) => {
   t.deepEqual(await evaluate(R62, { document }), [
     passed(R62, target, {
       1: Outcomes.IsDistinguishable(
-        [style, noStyle],
-        [style, noStyle],
-        [style, noStyle]
-      ),
-    }),
-  ]);
-});
-
-test(`evaluates() accepts decoration on parents of links`, async (t) => {
-  // Since text-decoration and focus outline is not inherited, the <span> has
-  // effectively no style other than color.
-  const target = <a href="#">Link</a>;
-
-  const document = h.document(
-    [
-      <p>
-        Hello <span>{target}</span>
-      </p>,
-    ],
-    [
-      h.sheet([
-        h.rule.style("a", {
-          textDecoration: "none",
-        }),
-        h.rule.style("a:focus", {
-          textDecoration: "none",
-          outline: "none",
-        }),
-        h.rule.style("span", { fontWeight: "bold" }),
-      ]),
-    ]
-  );
-
-  const linkStyle = Ok.of(
-    ComputedStyles.of([
-      ["border-width", "0px"],
-      ["color", "rgb(0% 0% 93.33333%)"],
-      ["font-weight", "700"],
-      ["outline", "0px"],
-    ])
-  );
-  const spanStyle = Ok.of(
-    ComputedStyles.of([
-      ["border-width", "0px"],
-      ["font-weight", "700"],
-      ["outline", "0px"],
-    ])
-  );
-
-  t.deepEqual(await evaluate(R62, { document }), [
-    passed(R62, target, {
-      1: Outcomes.IsDistinguishable(
-        [linkStyle, spanStyle],
-        [linkStyle, spanStyle],
-        [linkStyle, spanStyle]
-      ),
-    }),
-  ]);
-});
-
-test(`evaluates() deduplicate styles in diagnostic`, async (t) => {
-  // Since text-decoration and focus outline is not inherited, the <span> has
-  // effectively no style other than color.
-  const target = (
-    <a href="#">
-      <span>click</span> <span>here</span>
-    </a>
-  );
-
-  const document = h.document([<p>Hello {target}</p>]);
-
-  t.deepEqual(await evaluate(R62, { document }), [
-    passed(R62, target, {
-      1: Outcomes.IsDistinguishable(
-        [defaultStyle, noStyle],
-        [defaultStyle, noStyle],
-        [focusStyle, noStyle]
+        styles,
+        styles,
+        Ok.of(
+          ComputedStyles.of([
+            ["border-width", "0px"],
+            ["color", "rgb(0% 0% 93.33333%)"],
+            ["font-weight", "700"],
+            ["outline", "auto"],
+          ])
+        )
       ),
     }),
   ]);
diff --git a/packages/alfa-rules/test/sia-r69/rule.spec.tsx b/packages/alfa-rules/test/sia-r69/rule.spec.tsx
index b1079036c0..6799efc9b6 100644
--- a/packages/alfa-rules/test/sia-r69/rule.spec.tsx
+++ b/packages/alfa-rules/test/sia-r69/rule.spec.tsx
@@ -438,12 +438,3 @@ test(`evaluate() cannot tell when a background has a fixed size`, async (t) => {
 
   t.deepEqual(await evaluate(R69, { document }), [cantTell(R69, target)]);
 });
-
-test(`evaluate() cannot tell when encountering a text shadow`, async (t) => {
-  const target = h.text("Hello World");
-
-  const div = <div style={{ textShadow: "1px 1px" }}>{target}</div>;
-  const document = h.document([div]);
-
-  t.deepEqual(await evaluate(R69, { document }), [cantTell(R69, target)]);
-});
diff --git a/packages/alfa-rules/test/sia-r70/rule.spec.tsx b/packages/alfa-rules/test/sia-r70/rule.spec.tsx
new file mode 100644
index 0000000000..f4b85098cc
--- /dev/null
+++ b/packages/alfa-rules/test/sia-r70/rule.spec.tsx
@@ -0,0 +1,107 @@
+import { h } from "@siteimprove/alfa-dom";
+import { test } from "@siteimprove/alfa-test";
+
+import R70, { Outcomes } from "../../src/sia-r70/rule";
+
+import { evaluate } from "../common/evaluate";
+import { passed, failed, inapplicable } from "../common/outcome";
+
+test("evaluate() passes a page with no deprecated / obsolete elements ", async (t) => {
+  const target = (
+    <html>
+      <p>Lorem ipsum.</p>
+    </html>
+  );
+
+  const document = h.document([target]);
+
+  t.deepEqual(await evaluate(R70, { document }), [
+    passed(R70, document, {
+      1: Outcomes.HasNoDeprecatedElement,
+    }),
+  ]);
+});
+
+test("evaluate() passes a page with a deprecated but not rendered element", async (t) => {
+  const target = (
+    <html>
+      <p>
+        Lorem <blink hidden>ipsum</blink>
+      </p>
+    </html>
+  );
+
+  const document = h.document([target]);
+
+  t.deepEqual(await evaluate(R70, { document }), [
+    passed(R70, document, {
+      1: Outcomes.HasNoDeprecatedElement,
+    }),
+  ]);
+});
+
+test("evaluate() fails a page with deprecated and rendered element", async (t) => {
+  const blink = <blink>not</blink>;
+  const target = (
+    <html>
+      <p>Schrödinger's cat is {blink} dead.</p>
+    </html>
+  );
+
+  const document = h.document([target]);
+
+  t.deepEqual(await evaluate(R70, { document }), [
+    failed(R70, document, {
+      1: Outcomes.HasDeprecatedElements([blink]),
+    }),
+  ]);
+});
+
+test("evaluate() fails a page with deprecated visible element", async (t) => {
+  const blink = <blink aria-hidden="true">not</blink>;
+  const target = (
+    <html>
+      <p>Schrödinger's cat is {blink} dead.</p>
+    </html>
+  );
+
+  const document = h.document([target]);
+
+  t.deepEqual(await evaluate(R70, { document }), [
+    failed(R70, document, {
+      1: Outcomes.HasDeprecatedElements([blink]),
+    }),
+  ]);
+});
+
+test("evaluate() fails a page with two deprecated elements in the accessibility tree", async (t) => {
+  const menuitem1 = <menuitem role="menuitem">Foo</menuitem>;
+  const menuitem2 = <menuitem role="menuitem">Bar</menuitem>;
+  const target = (
+    <html>
+      <ul role="menu" style={{ position: "absolute", left: "-9999px" }}>
+        {menuitem1}
+        {menuitem2}
+      </ul>
+    </html>
+  );
+
+  const document = h.document([target]);
+
+  t.deepEqual(await evaluate(R70, { document }), [
+    failed(R70, document, {
+      1: Outcomes.HasDeprecatedElements([menuitem1, menuitem2]),
+    }),
+  ]);
+});
+
+test("evaluate() is inapplicable to non-HTML documents", async (t) => {
+  const document = h.document([
+    <svg xmlns="http://www.w3.org/2000/svg">
+      <title>This is a circle</title>
+      <circle cx="150" cy="75" r="50" fill="green"></circle>
+    </svg>,
+  ]);
+
+  t.deepEqual(await evaluate(R70, { document }), [inapplicable(R70)]);
+});
diff --git a/packages/alfa-rules/tsconfig.json b/packages/alfa-rules/tsconfig.json
index 448d2d2a94..5d01b95166 100644
--- a/packages/alfa-rules/tsconfig.json
+++ b/packages/alfa-rules/tsconfig.json
@@ -132,6 +132,7 @@
     "src/sia-r68/rule.ts",
     "src/sia-r69/rule.ts",
     "src/sia-r7/rule.ts",
+    "src/sia-r70/rule.ts",
     "src/sia-r71/rule.ts",
     "src/sia-r72/rule.ts",
     "src/sia-r73/rule.ts",
@@ -205,6 +206,7 @@
     "test/sia-r67/rule.spec.tsx",
     "test/sia-r68/rule.spec.tsx",
     "test/sia-r69/rule.spec.tsx",
+    "test/sia-r70/rule.spec.tsx",
     "test/sia-r71/rule.spec.tsx",
     "test/sia-r72/rule.spec.tsx",
     "test/sia-r73/rule.spec.tsx",
diff --git a/packages/alfa-sarif/package.json b/packages/alfa-sarif/package.json
index e2313e9039..f83503ede6 100644
--- a/packages/alfa-sarif/package.json
+++ b/packages/alfa-sarif/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-sarif",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling SARIF serializable structures",
   "repository": {
@@ -18,12 +18,12 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
     "@types/sarif": "^2.1.3"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-scraper/package.json b/packages/alfa-scraper/package.json
index 0e1715c566..7152d83ddd 100644
--- a/packages/alfa-scraper/package.json
+++ b/packages/alfa-scraper/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-scraper",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of a simple web scraper capable of producing page objects",
   "repository": {
@@ -18,24 +18,24 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-promise": "workspace:^0.20.0",
-    "@siteimprove/alfa-puppeteer": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-time": "workspace:^0.20.0",
-    "@siteimprove/alfa-url": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-promise": "workspace:^0.19.0",
+    "@siteimprove/alfa-puppeteer": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-time": "workspace:^0.19.0",
+    "@siteimprove/alfa-url": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "puppeteer": "^10.0.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-selective/package.json b/packages/alfa-selective/package.json
index 80d19b0636..82261fecc2 100644
--- a/packages/alfa-selective/package.json
+++ b/packages/alfa-selective/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-selective",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of a selective functor for modelling conditional function application",
   "repository": {
@@ -18,19 +18,18 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0",
-    "@siteimprove/alfa-either": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-monad": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-either": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-monad": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-selective/src/selective.ts b/packages/alfa-selective/src/selective.ts
index 0dad782aa3..f408044b7a 100644
--- a/packages/alfa-selective/src/selective.ts
+++ b/packages/alfa-selective/src/selective.ts
@@ -1,4 +1,3 @@
-import { Applicative } from "@siteimprove/alfa-applicative";
 import { Either, Left, Right } from "@siteimprove/alfa-either";
 import { Equatable } from "@siteimprove/alfa-equatable";
 import { Functor } from "@siteimprove/alfa-functor";
@@ -17,13 +16,11 @@ import { Refinement } from "@siteimprove/alfa-refinement";
 export class Selective<S, T = never>
   implements
     Functor<T>,
-    Applicative<T>,
     Monad<T>,
     Iterable<S | T>,
     Equatable,
     Hashable,
-    Serializable<Selective.JSON<S, T>>
-{
+    Serializable<Selective.JSON<S, T>> {
   public static of<T>(value: T): Selective<T> {
     return new Selective(Left.of(value));
   }
@@ -35,19 +32,14 @@ export class Selective<S, T = never>
   }
 
   public map<U>(mapper: Mapper<T, U>): Selective<S, U> {
-    return new Selective(this._value.map(mapper));
-  }
-
-  public apply<U>(mapper: Selective<S, Mapper<T, U>>): Selective<S, U> {
-    return mapper.flatMap((mapper) => this.map(mapper));
+    return this.flatMap((value) => new Selective(Right.of(mapper(value))));
   }
 
   public flatMap<U>(mapper: Mapper<T, Selective<S, U>>): Selective<S, U> {
-    return new Selective(this._value.flatMap((value) => mapper(value)._value));
-  }
-
-  public flatten<S, T>(this: Selective<S, Selective<S, T>>): Selective<S, T> {
-    return this.flatMap((selective) => selective);
+    return this._value.either(
+      (value) => new Selective(Left.of(value)),
+      (value) => mapper(value)
+    );
   }
 
   public if<P extends S, U>(
@@ -66,7 +58,7 @@ export class Selective<S, T = never>
   ): Selective<S, T | U> {
     return this._value.either(
       (value) =>
-        predicate(value) ? new Selective<S, U>(Right.of(mapper(value))) : this,
+        predicate(value) ? new Selective(Right.of(mapper(value))) : this,
       () => this
     );
   }
@@ -86,18 +78,6 @@ export class Selective<S, T = never>
     return this._value.get();
   }
 
-  /**
-   * Ensure that this {@link (Selective:class)} is exhaustively matched, returning
-   * its resulting value.
-   *
-   * @remarks
-   * This method should only be used for cases where {@link (Selective:class).get}
-   * is insufficient. If in doubt, assume that it isn't.
-   */
-  public exhaust<T>(this: Selective<never, T>): T {
-    return this.get();
-  }
-
   public equals<S, T>(value: Selective<S, T>): boolean;
 
   public equals(value: unknown): value is this;
@@ -132,4 +112,16 @@ export class Selective<S, T = never>
  */
 export namespace Selective {
   export type JSON<S, T = never> = Either.JSON<S, T>;
+
+  /**
+   * Ensure that a {@link (Selective:class)} is exhaustively matched, returning its
+   * resulting value.
+   *
+   * @remarks
+   * This function should only be used for cases where {@link (Selective:class).get}
+   * is insufficient. If in doubt, assume that it isn't.
+   */
+  export function exhaust<T>(selective: Selective<never, T>): T {
+    return selective.get();
+  }
 }
diff --git a/packages/alfa-selective/test/selective.spec.ts b/packages/alfa-selective/test/selective.spec.ts
index a7767187fb..dedd7cdc02 100644
--- a/packages/alfa-selective/test/selective.spec.ts
+++ b/packages/alfa-selective/test/selective.spec.ts
@@ -56,38 +56,3 @@ test(`#map() applies a function to a matched selective value`, (t) => {
     "WAS FOO"
   );
 });
-
-test(`#apply() applies a selective function to a selective value`, (t) => {
-  t.equal(
-    Selective.of("foo")
-      .if(isFoo, () => 2)
-      .apply(Selective.of("bar").if(isBar, () => (n) => n * 2))
-      .get(),
-    4
-  );
-});
-
-test(`#flatMap() applies a function to a matched selective value and flattens
-      the result`, (t) => {
-  t.equal(
-    Selective.of("foo")
-      .if(isFoo, () => "was foo")
-      .flatMap((wasFoo) =>
-        Selective.of("bar")
-          .if(isBar, () => "was bar")
-          .map((wasBar) => `${wasFoo} and ${wasBar}`)
-      )
-      .get(),
-    "was foo and was bar"
-  );
-});
-
-test(`#flatten() unwraps a nested selective value`, (t) => {
-  t.equal(
-    Selective.of("foo")
-      .else(() => Selective.of("bar"))
-      .flatten()
-      .get(),
-    "bar"
-  );
-});
diff --git a/packages/alfa-selective/tsconfig.json b/packages/alfa-selective/tsconfig.json
index 88562b89af..a5bb1bb726 100644
--- a/packages/alfa-selective/tsconfig.json
+++ b/packages/alfa-selective/tsconfig.json
@@ -3,9 +3,6 @@
   "extends": "../tsconfig.json",
   "files": ["src/index.ts", "src/selective.ts", "test/selective.spec.ts"],
   "references": [
-    {
-      "path": "../alfa-applicative"
-    },
     {
       "path": "../alfa-either"
     },
diff --git a/packages/alfa-selector/package.json b/packages/alfa-selector/package.json
index cb289f8ba9..8296483007 100644
--- a/packages/alfa-selector/package.json
+++ b/packages/alfa-selector/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-selector",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with CSS selectors and individual selector matching",
   "repository": {
@@ -18,21 +18,21 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-css": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-map": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-parser": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-slice": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-css": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-map": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-parser": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-slice": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-sequence/package.json b/packages/alfa-sequence/package.json
index de49a304b5..cd975a1974 100644
--- a/packages/alfa-sequence/package.json
+++ b/packages/alfa-sequence/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-sequence",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of a lazy, immutable sequence structure, which is similar to a list but lazily evaluated",
   "repository": {
@@ -18,25 +18,25 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-collection": "workspace:^0.20.0",
-    "@siteimprove/alfa-comparable": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-lazy": "workspace:^0.20.0",
-    "@siteimprove/alfa-map": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-set": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-collection": "workspace:^0.19.0",
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-lazy": "workspace:^0.19.0",
+    "@siteimprove/alfa-map": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-set": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-sequence/src/cons.ts b/packages/alfa-sequence/src/cons.ts
index 847fc7e499..8174a66839 100644
--- a/packages/alfa-sequence/src/cons.ts
+++ b/packages/alfa-sequence/src/cons.ts
@@ -1,7 +1,7 @@
 import { Array } from "@siteimprove/alfa-array";
 import { Callback } from "@siteimprove/alfa-callback";
 import { Collection } from "@siteimprove/alfa-collection";
-import { Comparable, Comparer, Comparison } from "@siteimprove/alfa-comparable";
+import { Comparer, Comparison } from "@siteimprove/alfa-comparable";
 import { Equatable } from "@siteimprove/alfa-equatable";
 import { Hash } from "@siteimprove/alfa-hash";
 import { Iterable } from "@siteimprove/alfa-iterable";
@@ -19,7 +19,6 @@ import { Sequence } from "./sequence";
 import { Nil } from "./nil";
 
 const { not, equals } = Predicate;
-const { compareComparable } = Comparable;
 
 /**
  * @public
@@ -68,10 +67,6 @@ export class Cons<T> implements Sequence<T> {
     );
   }
 
-  public apply<U>(mapper: Sequence<Mapper<T, U>>): Sequence<U> {
-    return mapper.flatMap((mapper) => this.map(mapper));
-  }
-
   public flatMap<U>(
     mapper: Mapper<T, Sequence<U>, [index: number]>
   ): Sequence<U>;
@@ -116,10 +111,6 @@ export class Cons<T> implements Sequence<T> {
     }
   }
 
-  public flatten<T>(this: Sequence<Sequence<T>>): Sequence<T> {
-    return this.flatMap((sequence) => sequence);
-  }
-
   public reduce<U>(reducer: Reducer<T, U, [index: number]>, accumulator: U): U {
     let next: Cons<T> = this;
     let index = 0;
@@ -170,6 +161,10 @@ export class Cons<T> implements Sequence<T> {
     return this.reduceWhile(not(predicate), reducer, accumulator);
   }
 
+  public apply<U>(mapper: Sequence<Mapper<T, U>>): Sequence<U> {
+    return this.flatMap((value) => mapper.map((mapper) => mapper(value)));
+  }
+
   public filter<U extends T>(
     refinement: Refinement<T, U, [index: number]>
   ): Sequence<U>;
@@ -405,10 +400,6 @@ export class Cons<T> implements Sequence<T> {
     }
 
     if (index === 0) {
-      if (Equatable.equals(value, this._head)) {
-        return this;
-      }
-
       return new Cons(value, this._tail);
     }
 
@@ -511,12 +502,6 @@ export class Cons<T> implements Sequence<T> {
     );
   }
 
-  public takeWhile<U extends T>(
-    refinement: Refinement<T, U, [index: number]>
-  ): Sequence<U>;
-
-  public takeWhile(predicate: Predicate<T, [index: number]>): Sequence<T>;
-
   public takeWhile(predicate: Predicate<T, [index: number]>): Sequence<T> {
     return this.takeUntil(not(predicate));
   }
@@ -553,12 +538,6 @@ export class Cons<T> implements Sequence<T> {
     return this.skip(this.size - count);
   }
 
-  public takeLastWhile<U extends T>(
-    refinement: Refinement<T, U, [index: number]>
-  ): Sequence<U>;
-
-  public takeLastWhile(predicate: Predicate<T, [index: number]>): Sequence<T>;
-
   public takeLastWhile(predicate: Predicate<T, [index: number]>): Sequence<T> {
     return this.reverse().takeWhile(predicate).reverse();
   }
@@ -666,25 +645,11 @@ export class Cons<T> implements Sequence<T> {
     }
   }
 
-  public sort<T extends Comparable<T>>(this: Sequence<T>): Sequence<T> {
-    return this.sortWith(compareComparable);
-  }
-
   public sortWith(comparer: Comparer<T>): Sequence<T> {
     return Sequence.fromArray(Array.sortWith(this.toArray(), comparer));
   }
 
-  public compare(
-    this: Sequence<Comparable<T>>,
-    iterable: Iterable<T>
-  ): Comparison {
-    return this.compareWith(iterable, Comparable.compare);
-  }
-
-  public compareWith<U = T>(
-    iterable: Iterable<U>,
-    comparer: Comparer<T, U, [index: number]>
-  ): Comparison {
+  public compareWith(iterable: Iterable<T>, comparer: Comparer<T>): Comparison {
     return Iterable.compareWith(this, iterable, comparer);
   }
 
diff --git a/packages/alfa-sequence/src/nil.ts b/packages/alfa-sequence/src/nil.ts
index 6c35413510..c260624e30 100644
--- a/packages/alfa-sequence/src/nil.ts
+++ b/packages/alfa-sequence/src/nil.ts
@@ -1,5 +1,5 @@
 import { Collection } from "@siteimprove/alfa-collection";
-import { Comparable, Comparer, Comparison } from "@siteimprove/alfa-comparable";
+import { Comparer, Comparison } from "@siteimprove/alfa-comparable";
 import { Hash } from "@siteimprove/alfa-hash";
 import { Iterable } from "@siteimprove/alfa-iterable";
 import { Map } from "@siteimprove/alfa-map";
@@ -31,18 +31,10 @@ export const Nil: Nil = new (class Nil {
     return this;
   }
 
-  public apply(): Nil {
-    return this;
-  }
-
   public flatMap(): Nil {
     return this;
   }
 
-  public flatten(): Nil {
-    return this;
-  }
-
   public reduce<U>(reducer: unknown, accumulator: U): U {
     return accumulator;
   }
@@ -63,6 +55,10 @@ export const Nil: Nil = new (class Nil {
     return accumulator;
   }
 
+  public apply(): Nil {
+    return this;
+  }
+
   public filter(): Nil {
     return this;
   }
@@ -235,24 +231,13 @@ export const Nil: Nil = new (class Nil {
     return "";
   }
 
-  public sort(): Nil {
-    return this;
-  }
-
   public sortWith(): Nil {
     return this;
   }
 
-  public compare<T>(
-    this: Sequence<Comparable<T>>,
-    iterable: Iterable<T>
-  ): Comparison {
-    return this.compareWith(iterable, Comparable.compare);
-  }
-
-  public compareWith<T, U = T>(
-    iterable: Iterable<U>,
-    comparer: Comparer<T, U, [index: number]>
+  public compareWith<T>(
+    iterable: Iterable<T>,
+    comparer: Comparer<T>
   ): Comparison {
     return Iterable.compareWith(this, iterable, comparer);
   }
diff --git a/packages/alfa-sequence/src/sequence.ts b/packages/alfa-sequence/src/sequence.ts
index 81e5e887a5..a92d747718 100644
--- a/packages/alfa-sequence/src/sequence.ts
+++ b/packages/alfa-sequence/src/sequence.ts
@@ -13,6 +13,8 @@ import { Refinement } from "@siteimprove/alfa-refinement";
 import { Cons } from "./cons";
 import { Nil } from "./nil";
 
+const { compareComparable } = Comparable;
+
 /**
  * @public
  */
@@ -20,9 +22,7 @@ export interface Sequence<T> extends Collection.Indexed<T> {
   isEmpty(): this is Sequence<never>;
   forEach(callback: Callback<T, void, [index: number]>): void;
   map<U>(mapper: Mapper<T, U, [index: number]>): Sequence<U>;
-  apply<U>(mapper: Sequence<Mapper<T, U>>): Sequence<U>;
   flatMap<U>(mapper: Mapper<T, Sequence<U>, [index: number]>): Sequence<U>;
-  flatten<T>(this: Sequence<Sequence<T>>): Sequence<T>;
   reduce<U>(reducer: Reducer<T, U, [index: number]>, accumulator: U): U;
   reduceWhile<U>(
     predicate: Predicate<T, [index: number]>,
@@ -34,6 +34,7 @@ export interface Sequence<T> extends Collection.Indexed<T> {
     reducer: Reducer<T, U, [index: number]>,
     accumulator: U
   ): U;
+  apply<U>(mapper: Sequence<Mapper<T, U>>): Sequence<U>;
   filter<U extends T>(
     refinement: Refinement<T, U, [index: number]>
   ): Sequence<U>;
@@ -65,15 +66,9 @@ export interface Sequence<T> extends Collection.Indexed<T> {
   first(): Option<T>;
   last(): Option<T>;
   take(count: number): Sequence<T>;
-  takeWhile<U extends T>(
-    refinement: Refinement<T, U, [index: number]>
-  ): Sequence<U>;
   takeWhile(predicate: Predicate<T, [index: number]>): Sequence<T>;
   takeUntil(predicate: Predicate<T, [index: number]>): Sequence<T>;
   takeLast(count: number): Sequence<T>;
-  takeLastWhile<U extends T>(
-    refinement: Refinement<T, U, [index: number]>
-  ): Sequence<U>;
   takeLastWhile(predicate: Predicate<T, [index: number]>): Sequence<T>;
   takeLastUntil(predicate: Predicate<T, [index: number]>): Sequence<T>;
   skip(count: number): Sequence<T>;
@@ -89,13 +84,8 @@ export interface Sequence<T> extends Collection.Indexed<T> {
   slice(start: number, end?: number): Sequence<T>;
   reverse(): Sequence<T>;
   join(separator: string): string;
-  sort<T extends Comparable<T>>(this: Sequence<T>): Sequence<T>;
   sortWith(comparer: Comparer<T>): Sequence<T>;
-  compare(this: Sequence<Comparable<T>>, iterable: Iterable<T>): Comparison;
-  compareWith<U = T>(
-    iterable: Iterable<U>,
-    comparer: Comparer<T, U, [index: number]>
-  ): Comparison;
+  compareWith(iterable: Iterable<T>, comparer: Comparer<T>): Comparison;
   groupBy<K>(grouper: Mapper<T, K, [index: number]>): Map<K, Sequence<T>>;
   toArray(): Array<T>;
   toJSON(): Sequence.JSON<T>;
@@ -139,6 +129,10 @@ export namespace Sequence {
     return Nil;
   }
 
+  export function flatten<T>(sequence: Sequence<Sequence<T>>): Sequence<T> {
+    return sequence.flatMap((sequence) => sequence);
+  }
+
   export function from<T>(iterable: Iterable<T>): Sequence<T> {
     if (isSequence(iterable)) {
       return iterable;
@@ -182,4 +176,17 @@ export namespace Sequence {
 
     return tail();
   }
+
+  export function sort<T extends Comparable<T>>(
+    sequence: Sequence<T>
+  ): Sequence<T> {
+    return sequence.sortWith(compareComparable);
+  }
+
+  export function compare<T extends Comparable<T>>(
+    a: Sequence<T>,
+    b: Iterable<T>
+  ): Comparison {
+    return a.compareWith(b, compareComparable);
+  }
 }
diff --git a/packages/alfa-sequence/test/sequence.spec.ts b/packages/alfa-sequence/test/sequence.spec.ts
index 2592225a06..6c6792449d 100644
--- a/packages/alfa-sequence/test/sequence.spec.ts
+++ b/packages/alfa-sequence/test/sequence.spec.ts
@@ -1,6 +1,5 @@
 import { test } from "@siteimprove/alfa-test";
 
-import { Comparable } from "@siteimprove/alfa-comparable";
 import { Option, None } from "@siteimprove/alfa-option";
 import { Lazy } from "@siteimprove/alfa-lazy";
 
@@ -58,13 +57,6 @@ test("#map() does not force the tail of a sequence", (t) => {
   ).map((n) => n + 1);
 });
 
-test("#apply() applies a sequence of functions to each value of a sequence", (t) => {
-  t.deepEqual(
-    [...seq.apply(Sequence.from([(n) => n + 1, (n) => n * 2]))],
-    [2, 3, 4, 5, 2, 4, 6, 8]
-  );
-});
-
 test("#flatMap() applies a function to each value of a sequence and flattens the result", (t) => {
   t.deepEqual(
     [...seq.flatMap((n) => Sequence.from([n, n]))],
@@ -85,12 +77,6 @@ test("#flatMap() behaves when a singleton sequence maps to an empty sequence", (
   t.deepEqual([...seq], []);
 });
 
-test("#flatten() unwraps a nested sequence", (t) => {
-  const seq = Sequence.from([Sequence.from([1, 2]), Sequence.from([3, 4])]);
-
-  t.deepEqual(seq.flatten().toArray(), [1, 2, 3, 4]);
-});
-
 test("#reduce() reduces a sequence of values to a single value", (t) => {
   t.equal(
     seq.reduce((acc, n) => acc + n, 0),
@@ -237,24 +223,6 @@ test("#join() joins the values of a sequence to a string", (t) => {
   t.equal(seq.join("-"), "foo-bar-baz");
 });
 
-test("#sort() sorts a sequence of comparable values", (t) => {
-  class Foo implements Comparable<Foo> {
-    value: number;
-
-    constructor(value: number) {
-      this.value = value;
-    }
-
-    compare(other: Foo) {
-      return Comparable.compare(this.value, other.value);
-    }
-  }
-
-  const seq = Sequence.from([new Foo(5), new Foo(3), new Foo(1)]);
-
-  t.deepEqual(seq.sort().toArray(), [new Foo(1), new Foo(3), new Foo(5)]);
-});
-
 test("#sortWith() sorts a sequence according to a comparer", (t) => {
   const seq = Sequence.from([5, 3, 6, 7, 1, 2, 4]);
 
diff --git a/packages/alfa-set/package.json b/packages/alfa-set/package.json
index 5436e3934d..a9de26302f 100644
--- a/packages/alfa-set/package.json
+++ b/packages/alfa-set/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-set",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of an immutable set structure, based on a hash array mapped trie",
   "repository": {
@@ -18,21 +18,21 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-collection": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-map": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-collection": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-map": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-set/src/set.ts b/packages/alfa-set/src/set.ts
index 8c1a41d6d9..54b4ad10d7 100644
--- a/packages/alfa-set/src/set.ts
+++ b/packages/alfa-set/src/set.ts
@@ -52,10 +52,6 @@ export class Set<T> implements Collection.Unkeyed<T> {
     );
   }
 
-  public apply<U>(mapper: Set<Mapper<T, U>>): Set<U> {
-    return mapper.flatMap((mapper) => this.map(mapper));
-  }
-
   public flatMap<U>(mapper: Mapper<T, Set<U>>): Set<U> {
     return this.reduce(
       (set, value) => set.concat(mapper(value)),
@@ -63,14 +59,14 @@ export class Set<T> implements Collection.Unkeyed<T> {
     );
   }
 
-  public flatten<T>(this: Set<Set<T>>): Set<T> {
-    return this.flatMap((set) => set);
-  }
-
   public reduce<U>(reducer: Reducer<T, U>, accumulator: U): U {
     return Iterable.reduce(this, reducer, accumulator);
   }
 
+  public apply<U>(mapper: Set<Mapper<T, U>>): Set<U> {
+    return this.flatMap((value) => mapper.map((mapper) => mapper(value)));
+  }
+
   public filter<U extends T>(refinement: Refinement<T, U>): Set<U>;
 
   public filter(predicate: Predicate<T>): Set<T>;
diff --git a/packages/alfa-slice/package.json b/packages/alfa-slice/package.json
index 2b7bc93d16..c8c7e91245 100644
--- a/packages/alfa-slice/package.json
+++ b/packages/alfa-slice/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-slice",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of an immutable slice structure, which provides an efficient view over an array",
   "repository": {
@@ -18,22 +18,22 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-collection": "workspace:^0.20.0",
-    "@siteimprove/alfa-comparable": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-collection": "workspace:^0.19.0",
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-slice/src/slice.ts b/packages/alfa-slice/src/slice.ts
index 5839ca553e..4beb9ce3a6 100644
--- a/packages/alfa-slice/src/slice.ts
+++ b/packages/alfa-slice/src/slice.ts
@@ -1,7 +1,7 @@
 import { Array } from "@siteimprove/alfa-array";
 import { Callback } from "@siteimprove/alfa-callback";
 import { Collection } from "@siteimprove/alfa-collection";
-import { Comparable, Comparer, Comparison } from "@siteimprove/alfa-comparable";
+import { Comparer, Comparison } from "@siteimprove/alfa-comparable";
 import { Equatable } from "@siteimprove/alfa-equatable";
 import { Hash } from "@siteimprove/alfa-hash";
 import { Iterable } from "@siteimprove/alfa-iterable";
@@ -13,7 +13,6 @@ import { Reducer } from "@siteimprove/alfa-reducer";
 import { Refinement } from "@siteimprove/alfa-refinement";
 
 const { not } = Predicate;
-const { compareComparable } = Comparable;
 
 /**
  * @public
@@ -79,22 +78,12 @@ export class Slice<T> implements Collection.Indexed<T> {
     return new Slice(result, 0, result.length);
   }
 
-  public apply<U>(mapper: Slice<Mapper<T, U>>): Slice<U> {
-    const array = [...Iterable.apply(this, mapper)];
-
-    return new Slice(array, 0, array.length);
-  }
-
   public flatMap<U>(mapper: Mapper<T, Slice<U>, [index: number]>): Slice<U> {
     const array = [...Iterable.flatMap(this, mapper)];
 
     return new Slice(array, 0, array.length);
   }
 
-  public flatten<T>(this: Slice<Slice<T>>): Slice<T> {
-    return this.flatMap((slice) => slice);
-  }
-
   public reduce<U>(reducer: Reducer<T, U, [index: number]>, accumulator: U): U {
     return Iterable.reduce(this, reducer, accumulator);
   }
@@ -115,6 +104,12 @@ export class Slice<T> implements Collection.Indexed<T> {
     return Iterable.reduceUntil(this, predicate, reducer, accumulator);
   }
 
+  public apply<U>(mapper: Slice<Mapper<T, U>>): Slice<U> {
+    const array = [...Iterable.apply(this, mapper)];
+
+    return new Slice(array, 0, array.length);
+  }
+
   public filter<U extends T>(
     refinement: Refinement<T, U, [index: number]>
   ): Slice<U>;
@@ -269,12 +264,6 @@ export class Slice<T> implements Collection.Indexed<T> {
     return this.slice(0, count);
   }
 
-  public takeWhile<U extends T>(
-    refinement: Refinement<T, U, [index: number]>
-  ): Slice<U>;
-
-  public takeWhile(predicate: Predicate<T, [index: number]>): Slice<T>;
-
   public takeWhile(predicate: Predicate<T, [index: number]>): Slice<T> {
     let count = 0;
 
@@ -297,12 +286,6 @@ export class Slice<T> implements Collection.Indexed<T> {
     return this.slice(this._length - count);
   }
 
-  public takeLastWhile<U extends T>(
-    refinement: Refinement<T, U, [index: number]>
-  ): Slice<U>;
-
-  public takeLastWhile(predicate: Predicate<T, [index: number]>): Slice<T>;
-
   public takeLastWhile(predicate: Predicate<T, [index: number]>): Slice<T> {
     let count = 0;
 
@@ -401,27 +384,13 @@ export class Slice<T> implements Collection.Indexed<T> {
     return Iterable.join(this, separator);
   }
 
-  public sort<T extends Comparable<T>>(this: Slice<T>): Slice<T> {
-    return this.sortWith(compareComparable);
-  }
-
   public sortWith(comparer: Comparer<T>): Slice<T> {
     const array = Array.sortWith(this.toArray(), comparer);
 
     return new Slice(array, 0, array.length);
   }
 
-  public compare(
-    this: Slice<Comparable<T>>,
-    iterable: Iterable<T>
-  ): Comparison {
-    return this.compareWith(iterable, compareComparable);
-  }
-
-  public compareWith<U = T>(
-    iterable: Iterable<U>,
-    comparer: Comparer<T, U, [index: number]>
-  ): Comparison {
+  public compareWith(iterable: Iterable<T>, comparer: Comparer<T>): Comparison {
     return Iterable.compareWith(this, iterable, comparer);
   }
 
diff --git a/packages/alfa-style/package.json b/packages/alfa-style/package.json
index 093bb0d805..412b42b692 100644
--- a/packages/alfa-style/package.json
+++ b/packages/alfa-style/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-style",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of the CSS style system capable of resolving and computing style information for DOM nodes",
   "repository": {
@@ -18,32 +18,31 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0",
-    "@siteimprove/alfa-cache": "workspace:^0.20.0",
-    "@siteimprove/alfa-cascade": "workspace:^0.20.0",
-    "@siteimprove/alfa-css": "workspace:^0.20.0",
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-either": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-math": "workspace:^0.20.0",
-    "@siteimprove/alfa-monad": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-parser": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-record": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-selector": "workspace:^0.20.0",
-    "@siteimprove/alfa-set": "workspace:^0.20.0",
-    "@siteimprove/alfa-slice": "workspace:^0.20.0"
+    "@siteimprove/alfa-cache": "workspace:^0.19.0",
+    "@siteimprove/alfa-cascade": "workspace:^0.19.0",
+    "@siteimprove/alfa-css": "workspace:^0.19.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-either": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-math": "workspace:^0.19.0",
+    "@siteimprove/alfa-monad": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-parser": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-record": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-selector": "workspace:^0.19.0",
+    "@siteimprove/alfa-set": "workspace:^0.19.0",
+    "@siteimprove/alfa-slice": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-style/src/index.ts b/packages/alfa-style/src/index.ts
index 3fa9bb06a6..bcffecc981 100644
--- a/packages/alfa-style/src/index.ts
+++ b/packages/alfa-style/src/index.ts
@@ -125,7 +125,6 @@ import "./property/text-decoration-thickness";
 import "./property/text-indent";
 import "./property/text-overflow";
 import "./property/text-transform";
-import "./property/text-shadow";
 import "./property/top";
 import "./property/transform";
 import "./property/visibility";
diff --git a/packages/alfa-style/src/property/text-shadow.ts b/packages/alfa-style/src/property/text-shadow.ts
deleted file mode 100644
index 3226452b66..0000000000
--- a/packages/alfa-style/src/property/text-shadow.ts
+++ /dev/null
@@ -1,111 +0,0 @@
-import {
-  Color,
-  Current,
-  Keyword,
-  Length,
-  Percentage,
-  RGB,
-  Shadow,
-  System,
-  Token,
-} from "@siteimprove/alfa-css";
-import { Parser } from "@siteimprove/alfa-parser";
-import { Slice } from "@siteimprove/alfa-slice";
-
-import { Property } from "../property";
-import { Resolver } from "../resolver";
-
-const { isKeyword } = Keyword;
-const { either, left, map, option, pair, right, separated } = Parser;
-
-declare module "../property" {
-  interface Longhands {
-    "text-shadow": Property<Specified, Computed>;
-  }
-}
-
-/**
- * @internal
- */
-export type Specified = Keyword<"none"> | Shadow;
-
-/**
- * @internal
- */
-export type Computed =
-  | Keyword<"none">
-  | Shadow<
-      Length<"px">,
-      Length<"px">,
-      Length<"px">,
-      Length<"px">,
-      RGB<Percentage, Percentage> | Current | System
-    >;
-
-const parseOffset = separated(Length.parse, Token.parseWhitespace);
-
-const parseLengths = pair(
-  parseOffset,
-  map(option(right(Token.parseWhitespace, Length.parse)), (blur) =>
-    blur.getOr(Length.of(0, "px"))
-  )
-);
-
-/**
- * @internal
- */
-export const parse = either<Slice<Token>, Specified, string>(
-  Keyword.parse("none"),
-  map(
-    pair(parseLengths, option(right(Token.parseWhitespace, Color.parse))),
-    ([[[x, y], blur], color]) =>
-      Shadow.of(
-        y,
-        x,
-        blur,
-        Length.of(0, "px"),
-        color.getOr(Color.current),
-        false
-      )
-  ),
-  map(
-    pair(option(left(Color.parse, Token.parseWhitespace)), parseLengths),
-    ([color, [[x, y], blur]]) =>
-      Shadow.of(
-        y,
-        x,
-        blur,
-        Length.of(0, "px"),
-        color.getOr(Color.current),
-        false
-      )
-  )
-);
-
-/**
- * {@link https://developer.mozilla.org/en-US/docs/Web/CSS/text-shadow}
- * @internal
- */
-export default Property.register(
-  "text-shadow",
-  Property.of<Specified, Computed>(
-    Keyword.of("none"),
-    parse,
-    (shadow, style) =>
-      shadow.map((shadow) => {
-        if (isKeyword(shadow)) {
-          return shadow;
-        }
-
-        return Shadow.of(
-          Resolver.length(shadow.vertical, style),
-          Resolver.length(shadow.horizontal, style),
-          Resolver.length(shadow.blur, style),
-          Resolver.length(shadow.spread, style),
-          Resolver.color(shadow.color),
-          false
-        );
-      }),
-    { inherits: true }
-  )
-);
diff --git a/packages/alfa-style/src/style.ts b/packages/alfa-style/src/style.ts
index f0b9935461..b8e0a83378 100644
--- a/packages/alfa-style/src/style.ts
+++ b/packages/alfa-style/src/style.ts
@@ -477,7 +477,7 @@ const substitutionLimit = 1024;
 
 /**
  * Substitute `var()` functions in an array of tokens. If any syntactically
- * invalid `var()` functions are encountered, `None` is returned.
+ * invalid `var()` functions are encountered, `null` is returned.
  *
  * {@link https://drafts.csswg.org/css-variables/#substitute-a-var}
  *
diff --git a/packages/alfa-style/src/value.ts b/packages/alfa-style/src/value.ts
index 737f1b8a7a..b0ed880b43 100644
--- a/packages/alfa-style/src/value.ts
+++ b/packages/alfa-style/src/value.ts
@@ -1,4 +1,3 @@
-import { Applicative } from "@siteimprove/alfa-applicative";
 import { Declaration } from "@siteimprove/alfa-dom";
 import { Equatable } from "@siteimprove/alfa-equatable";
 import { Functor } from "@siteimprove/alfa-functor";
@@ -16,12 +15,10 @@ import * as json from "@siteimprove/alfa-json";
 export class Value<T = unknown>
   implements
     Functor<T>,
-    Applicative<T>,
     Monad<T>,
     Iterable<T>,
     Equatable,
-    Serializable<Value.JSON<T>>
-{
+    Serializable<Value.JSON<T>> {
   public static of<T>(value: T, source: Option<Declaration> = None): Value<T> {
     return new Value(value, source);
   }
@@ -46,18 +43,10 @@ export class Value<T = unknown>
     return new Value(mapper(this._value), this._source);
   }
 
-  public apply<U>(mapper: Value<Mapper<T, U>>): Value<U> {
-    return mapper.map((mapper) => mapper(this._value));
-  }
-
   public flatMap<U>(mapper: Mapper<T, Value<U>>): Value<U> {
     return mapper(this._value);
   }
 
-  public flatten<T>(this: Value<Value<T>>): Value<T> {
-    return this._value;
-  }
-
   public includes(value: T): boolean {
     return Equatable.equals(this._value, value);
   }
diff --git a/packages/alfa-style/test/property/text-shadow.spec.tsx b/packages/alfa-style/test/property/text-shadow.spec.tsx
deleted file mode 100644
index d7b82e78ce..0000000000
--- a/packages/alfa-style/test/property/text-shadow.spec.tsx
+++ /dev/null
@@ -1,78 +0,0 @@
-import { test } from "@siteimprove/alfa-test";
-import { Device } from "@siteimprove/alfa-device";
-
-import { Style } from "../../src/style";
-
-const device = Device.standard();
-
-test(`.cascaded() parses \`text-shadow: 1px 1px 2px black;\``, (t) => {
-  const element = (
-    <span style={{ textShadow: "1px 1px 2px black" }}>Hello world</span>
-  );
-
-  const style = Style.from(element, device);
-
-  t.deepEqual(style.cascaded("text-shadow").get().toJSON().value, {
-    type: "shadow",
-    vertical: { type: "length", value: 1, unit: "px" },
-    horizontal: { type: "length", value: 1, unit: "px" },
-    blur: { type: "length", value: 2, unit: "px" },
-    spread: { type: "length", value: 0, unit: "px" },
-    color: { type: "color", format: "named", color: "black" },
-    isInset: false,
-  });
-});
-
-test(`.cascaded() parses \`text-shadow: 1px 1px 2px;\``, (t) => {
-  const element = (
-    <span style={{ textShadow: "1px 1px 2px" }}>Hello world</span>
-  );
-
-  const style = Style.from(element, device);
-
-  t.deepEqual(style.cascaded("text-shadow").get().toJSON().value, {
-    type: "shadow",
-    vertical: { type: "length", value: 1, unit: "px" },
-    horizontal: { type: "length", value: 1, unit: "px" },
-    blur: { type: "length", value: 2, unit: "px" },
-    spread: { type: "length", value: 0, unit: "px" },
-    color: { type: "keyword", value: "currentcolor" },
-    isInset: false,
-  });
-});
-
-test(`.cascaded() parses \`text-shadow: 1px 1px black;\``, (t) => {
-  const element = (
-    <span style={{ textShadow: "1px 1px black" }}>Hello world</span>
-  );
-
-  const style = Style.from(element, device);
-
-  t.deepEqual(style.cascaded("text-shadow").get().toJSON().value, {
-    type: "shadow",
-    vertical: { type: "length", value: 1, unit: "px" },
-    horizontal: { type: "length", value: 1, unit: "px" },
-    blur: { type: "length", value: 0, unit: "px" },
-    spread: { type: "length", value: 0, unit: "px" },
-    color: { type: "color", format: "named", color: "black" },
-    isInset: false,
-  });
-});
-
-test(`.cascaded() parses \`text-shadow: black 1px 1px;\``, (t) => {
-  const element = (
-    <span style={{ textShadow: "black 1px 1px" }}>Hello world</span>
-  );
-
-  const style = Style.from(element, device);
-
-  t.deepEqual(style.cascaded("text-shadow").get().toJSON().value, {
-    type: "shadow",
-    vertical: { type: "length", value: 1, unit: "px" },
-    horizontal: { type: "length", value: 1, unit: "px" },
-    blur: { type: "length", value: 0, unit: "px" },
-    spread: { type: "length", value: 0, unit: "px" },
-    color: { type: "color", format: "named", color: "black" },
-    isInset: false,
-  });
-});
diff --git a/packages/alfa-style/tsconfig.json b/packages/alfa-style/tsconfig.json
index 321d0776c5..6b7bddb5c0 100644
--- a/packages/alfa-style/tsconfig.json
+++ b/packages/alfa-style/tsconfig.json
@@ -130,7 +130,6 @@
     "src/property/text-indent.ts",
     "src/property/text-overflow.ts",
     "src/property/text-transform.ts",
-    "src/property/text-shadow.ts",
     "src/property/top.ts",
     "src/property/transform.ts",
     "src/property/value/list.ts",
@@ -176,13 +175,9 @@
     "test/property/inset-block.spec.tsx",
     "test/property/text-decoration.spec.tsx",
     "test/property/text-indent.spec.tsx",
-    "test/property/text-shadow.spec.tsx",
     "test/style.spec.tsx"
   ],
   "references": [
-    {
-      "path": "../alfa-applicative"
-    },
     {
       "path": "../alfa-cache"
     },
diff --git a/packages/alfa-table/package.json b/packages/alfa-table/package.json
index fcc706323c..24feb7274d 100644
--- a/packages/alfa-table/package.json
+++ b/packages/alfa-table/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-table",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of the HTML table model for forming and laying out tables",
   "repository": {
@@ -18,20 +18,20 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-cache": "workspace:^0.20.0",
-    "@siteimprove/alfa-comparable": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-math": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-cache": "workspace:^0.19.0",
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-math": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-table/test/table.spec.tsx b/packages/alfa-table/test/table.spec.tsx
index 54af2b080c..63819134b2 100644
--- a/packages/alfa-table/test/table.spec.tsx
+++ b/packages/alfa-table/test/table.spec.tsx
@@ -565,78 +565,6 @@ test(`.from() assigns headers within a column group`, (t) => {
   });
 });
 
-test(`.from() assigns explicit column headers`, (t) => {
-  const table = Table.from(
-    <table>
-      <tr>
-        <th scope="col">A</th>
-      </tr>
-      <tr>
-        <td>1</td>
-      </tr>
-    </table>
-  );
-
-  t.deepEqual(table.toJSON(), {
-    element: "/table[1]",
-    cells: [
-      {
-        type: "header",
-        scope: "column",
-        element: "/table[1]/tr[1]/th[1]",
-        anchor: { x: 0, y: 0 },
-        width: 1,
-        height: 1,
-        headers: [],
-      },
-      {
-        type: "data",
-        element: "/table[1]/tr[2]/td[1]",
-        anchor: { x: 0, y: 1 },
-        width: 1,
-        height: 1,
-        headers: [{ x: 0, y: 0 }],
-      },
-    ],
-    groups: [],
-  });
-});
-
-test(`.from() assigns explicit row headers`, (t) => {
-  const table = Table.from(
-    <table>
-      <tr>
-        <th scope="row">A</th>
-        <td>1</td>
-      </tr>
-    </table>
-  );
-
-  t.deepEqual(table.toJSON(), {
-    element: "/table[1]",
-    cells: [
-      {
-        type: "header",
-        scope: "row",
-        element: "/table[1]/tr[1]/th[1]",
-        anchor: { x: 0, y: 0 },
-        width: 1,
-        height: 1,
-        headers: [],
-      },
-      {
-        type: "data",
-        element: "/table[1]/tr[1]/td[1]",
-        anchor: { x: 1, y: 0 },
-        width: 1,
-        height: 1,
-        headers: [{ x: 0, y: 0 }],
-      },
-    ],
-    groups: [],
-  });
-});
-
 test(`.from() gracefully handles invalid elements in tables`, (t) => {
   const table = Table.from(
     <table>
diff --git a/packages/alfa-test/package.json b/packages/alfa-test/package.json
index 16b34fefa2..debb486114 100644
--- a/packages/alfa-test/package.json
+++ b/packages/alfa-test/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-test",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "A simple test library sitting on top of the built-in Node.js assert module",
   "repository": {
@@ -18,7 +18,7 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-highlight": "workspace:^0.20.0",
+    "@siteimprove/alfa-highlight": "workspace:^0.19.0",
     "@types/node": "^14.14.31"
   },
   "publishConfig": {
diff --git a/packages/alfa-thenable/package.json b/packages/alfa-thenable/package.json
index e8419546ec..03fa372b76 100644
--- a/packages/alfa-thenable/package.json
+++ b/packages/alfa-thenable/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-thenable",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with thenables, which are promise-like structures that can be awaited",
   "repository": {
@@ -18,10 +18,10 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-callback": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-thunk/package.json b/packages/alfa-thunk/package.json
index d09929eaa3..485ecbc40a 100644
--- a/packages/alfa-thunk/package.json
+++ b/packages/alfa-thunk/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-thunk",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with thunks, which are computations that are delayed until needed",
   "repository": {
@@ -18,11 +18,11 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-time/package.json b/packages/alfa-time/package.json
index 995a60f1fe..72b5d2cb02 100644
--- a/packages/alfa-time/package.json
+++ b/packages/alfa-time/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-time",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with time",
   "repository": {
@@ -18,7 +18,7 @@
     "src/**/*.d.ts"
   ],
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-trampoline/package.json b/packages/alfa-trampoline/package.json
index bde828faf9..010e4e575d 100644
--- a/packages/alfa-trampoline/package.json
+++ b/packages/alfa-trampoline/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-trampoline",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of a trampoline structure, which is used for achieving tail-recursive function calls without relying on built-in language support",
   "repository": {
@@ -18,19 +18,19 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0",
-    "@siteimprove/alfa-array": "workspace:^0.20.0",
-    "@siteimprove/alfa-callback": "workspace:^0.20.0",
-    "@siteimprove/alfa-foldable": "workspace:^0.20.0",
-    "@siteimprove/alfa-functor": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-monad": "workspace:^0.20.0",
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0",
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-applicative": "workspace:^0.19.0",
+    "@siteimprove/alfa-array": "workspace:^0.19.0",
+    "@siteimprove/alfa-callback": "workspace:^0.19.0",
+    "@siteimprove/alfa-foldable": "workspace:^0.19.0",
+    "@siteimprove/alfa-functor": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-monad": "workspace:^0.19.0",
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0",
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-trampoline/src/trampoline.ts b/packages/alfa-trampoline/src/trampoline.ts
index ce2ef25ae5..870c3192d6 100644
--- a/packages/alfa-trampoline/src/trampoline.ts
+++ b/packages/alfa-trampoline/src/trampoline.ts
@@ -15,8 +15,7 @@ import { Thunk } from "@siteimprove/alfa-thunk";
  * @public
  */
 export abstract class Trampoline<T>
-  implements Functor<T>, Applicative<T>, Monad<T>, Foldable<T>, Iterable<T>
-{
+  implements Functor<T>, Monad<T>, Foldable<T>, Applicative<T>, Iterable<T> {
   protected abstract step(): Trampoline<T>;
 
   public run(): T {
@@ -41,20 +40,16 @@ export abstract class Trampoline<T>
     return this.flatMap((value) => Done.of(mapper(value)));
   }
 
-  public apply<U>(mapper: Trampoline<Mapper<T, U>>): Trampoline<U> {
-    return mapper.flatMap((mapper) => this.map(mapper));
-  }
-
   public abstract flatMap<U>(mapper: Mapper<T, Trampoline<U>>): Trampoline<U>;
 
-  public flatten<T>(this: Trampoline<Trampoline<T>>): Trampoline<T> {
-    return this.flatMap((trampoline) => trampoline);
-  }
-
   public reduce<U>(reducer: Reducer<T, U>, accumulator: U): U {
     return reducer(accumulator, this.run());
   }
 
+  public apply<U>(mapper: Trampoline<Mapper<T, U>>): Trampoline<U> {
+    return this.flatMap((value) => mapper.map((mapper) => mapper(value)));
+  }
+
   public tee(callback: Callback<T>): Trampoline<T> {
     return this.map((value) => {
       callback(value);
diff --git a/packages/alfa-trilean/package.json b/packages/alfa-trilean/package.json
index 475af0b696..5b4434eb80 100644
--- a/packages/alfa-trilean/package.json
+++ b/packages/alfa-trilean/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-trilean",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with trilean logic, which is logic involving three possible truth values",
   "repository": {
@@ -18,11 +18,11 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-unexpected/package.json b/packages/alfa-unexpected/package.json
index d4c22b00b0..3265a5e21c 100644
--- a/packages/alfa-unexpected/package.json
+++ b/packages/alfa-unexpected/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-unexpected",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Assertion integrations for the Unexpected testing framework",
   "repository": {
@@ -19,15 +19,15 @@
     "types/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-act": "workspace:^0.20.0",
-    "@siteimprove/alfa-assert": "workspace:^0.20.0",
-    "@siteimprove/alfa-future": "workspace:^0.20.0",
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-act": "workspace:^0.19.0",
+    "@siteimprove/alfa-assert": "workspace:^0.19.0",
+    "@siteimprove/alfa-future": "workspace:^0.19.0",
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "unexpected": "^12.0.3"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-url/package.json b/packages/alfa-url/package.json
index 20138dc2c4..bf9ef50d2d 100644
--- a/packages/alfa-url/package.json
+++ b/packages/alfa-url/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-url",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Functionality for working with immutable URLs",
   "repository": {
@@ -18,16 +18,16 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-hash": "workspace:^0.20.0",
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-hash": "workspace:^0.19.0",
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-vue/package.json b/packages/alfa-vue/package.json
index 25e259f9c1..d99aab1793 100644
--- a/packages/alfa-vue/package.json
+++ b/packages/alfa-vue/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-vue",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Integrations and utilities for the Vue.js component framework",
   "repository": {
@@ -18,17 +18,17 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-cheerio": "workspace:^0.20.0",
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-cheerio": "workspace:^0.19.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "@vue/test-utils": "^1.0.0-beta.29",
     "vue": "^2.6.14",
     "vue-template-compiler": "^2.6.14"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-wcag/package.json b/packages/alfa-wcag/package.json
index 510e2e5cf0..de7476747d 100644
--- a/packages/alfa-wcag/package.json
+++ b/packages/alfa-wcag/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-wcag",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for working with WCAG-related information in a structured manner",
   "repository": {
@@ -21,13 +21,13 @@
     "generate": "node scripts/criteria.js && node scripts/techniques.js"
   },
   "dependencies": {
-    "@siteimprove/alfa-act": "workspace:^0.20.0",
-    "@siteimprove/alfa-branched": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0",
+    "@siteimprove/alfa-branched": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-web/package.json b/packages/alfa-web/package.json
index b6a0ca0b8e..6c04eb9661 100644
--- a/packages/alfa-web/package.json
+++ b/packages/alfa-web/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-web",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Types for modelling web resources, such as individual web pages and entire web sites",
   "repository": {
@@ -20,18 +20,18 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-earl": "workspace:^0.20.0",
-    "@siteimprove/alfa-encoding": "workspace:^0.20.0",
-    "@siteimprove/alfa-graph": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-sarif": "workspace:^0.20.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-earl": "workspace:^0.19.0",
+    "@siteimprove/alfa-encoding": "workspace:^0.19.0",
+    "@siteimprove/alfa-graph": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-sarif": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-webdriver/package.json b/packages/alfa-webdriver/package.json
index 6c34c26d02..737b1725ee 100644
--- a/packages/alfa-webdriver/package.json
+++ b/packages/alfa-webdriver/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-webdriver",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "Integrations and utilities for the WebdriverIO browser automation library",
   "repository": {
@@ -18,14 +18,14 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-device": "workspace:^0.20.0",
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-http": "workspace:^0.20.0",
-    "@siteimprove/alfa-web": "workspace:^0.20.0",
+    "@siteimprove/alfa-device": "workspace:^0.19.0",
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-http": "workspace:^0.19.0",
+    "@siteimprove/alfa-web": "workspace:^0.19.0",
     "webdriverio": "^7.7.3"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/packages/alfa-xpath/package.json b/packages/alfa-xpath/package.json
index c2e14cca4d..5d5de92398 100644
--- a/packages/alfa-xpath/package.json
+++ b/packages/alfa-xpath/package.json
@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/package",
   "name": "@siteimprove/alfa-xpath",
   "homepage": "https://alfa.siteimprove.com",
-  "version": "0.20.0",
+  "version": "0.19.0",
   "license": "MIT",
   "description": "An implementation of a subset of the XPath query language",
   "repository": {
@@ -18,18 +18,18 @@
     "src/**/*.d.ts"
   ],
   "dependencies": {
-    "@siteimprove/alfa-dom": "workspace:^0.20.0",
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0",
-    "@siteimprove/alfa-json": "workspace:^0.20.0",
-    "@siteimprove/alfa-option": "workspace:^0.20.0",
-    "@siteimprove/alfa-parser": "workspace:^0.20.0",
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0",
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0",
-    "@siteimprove/alfa-result": "workspace:^0.20.0",
-    "@siteimprove/alfa-slice": "workspace:^0.20.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0",
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0",
+    "@siteimprove/alfa-json": "workspace:^0.19.0",
+    "@siteimprove/alfa-option": "workspace:^0.19.0",
+    "@siteimprove/alfa-parser": "workspace:^0.19.0",
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0",
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0",
+    "@siteimprove/alfa-result": "workspace:^0.19.0",
+    "@siteimprove/alfa-slice": "workspace:^0.19.0"
   },
   "devDependencies": {
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   },
   "publishConfig": {
     "access": "public",
diff --git a/scripts/publish.sh b/scripts/publish.sh
index 008e5c6814..70a713d133 100644
--- a/scripts/publish.sh
+++ b/scripts/publish.sh
@@ -2,5 +2,5 @@ set -e
 
 yarn workspaces foreach \
   --no-private \
-  --topological-dev \
+  --topological \
   npm publish
diff --git a/scripts/version.sh b/scripts/version.sh
index b6595af854..35b89ff11c 100644
--- a/scripts/version.sh
+++ b/scripts/version.sh
@@ -2,7 +2,7 @@ set -e
 
 yarn workspaces foreach \
   --no-private \
-  --topological-dev \
+  --topological \
   version --deferred "$@"
 
 yarn version apply --all
diff --git a/yarn.lock b/yarn.lock
index ee6566505c..a1755ed2dd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -929,41 +929,40 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@siteimprove/alfa-act@workspace:^0.20.0, @siteimprove/alfa-act@workspace:packages/alfa-act":
+"@siteimprove/alfa-act@workspace:^0.19.0, @siteimprove/alfa-act@workspace:packages/alfa-act":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-act@workspace:packages/alfa-act"
   dependencies:
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0"
-    "@siteimprove/alfa-earl": "workspace:^0.20.0"
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-functor": "workspace:^0.20.0"
-    "@siteimprove/alfa-future": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-list": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-monad": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-performance": "workspace:^0.20.0"
-    "@siteimprove/alfa-record": "workspace:^0.20.0"
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
-    "@siteimprove/alfa-sarif": "workspace:^0.20.0"
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
-    "@siteimprove/alfa-trilean": "workspace:^0.20.0"
+    "@siteimprove/alfa-earl": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-functor": "workspace:^0.19.0"
+    "@siteimprove/alfa-future": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-list": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-monad": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-performance": "workspace:^0.19.0"
+    "@siteimprove/alfa-record": "workspace:^0.19.0"
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
+    "@siteimprove/alfa-sarif": "workspace:^0.19.0"
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
+    "@siteimprove/alfa-trilean": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-affine@workspace:^0.20.0, @siteimprove/alfa-affine@workspace:packages/alfa-affine":
+"@siteimprove/alfa-affine@workspace:^0.19.0, @siteimprove/alfa-affine@workspace:packages/alfa-affine":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-affine@workspace:packages/alfa-affine"
   dependencies:
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-math": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-math": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -972,154 +971,153 @@ __metadata:
   resolution: "@siteimprove/alfa-angular@workspace:packages/alfa-angular"
   dependencies:
     "@angular/core": ^11.0.0
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-http": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     rxjs: ^7.1.0
     zone.js: ^0.11.4
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-applicative@workspace:^0.20.0, @siteimprove/alfa-applicative@workspace:packages/alfa-applicative":
+"@siteimprove/alfa-applicative@workspace:^0.19.0, @siteimprove/alfa-applicative@workspace:packages/alfa-applicative":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-applicative@workspace:packages/alfa-applicative"
   dependencies:
-    "@siteimprove/alfa-functor": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-aria@workspace:^0.20.0, @siteimprove/alfa-aria@workspace:packages/alfa-aria":
+"@siteimprove/alfa-aria@workspace:^0.19.0, @siteimprove/alfa-aria@workspace:packages/alfa-aria":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-aria@workspace:packages/alfa-aria"
   dependencies:
-    "@siteimprove/alfa-array": "workspace:^0.20.0"
-    "@siteimprove/alfa-branched": "workspace:^0.20.0"
-    "@siteimprove/alfa-cache": "workspace:^0.20.0"
-    "@siteimprove/alfa-compatibility": "workspace:^0.20.0"
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-graph": "workspace:^0.20.0"
-    "@siteimprove/alfa-hash": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-lazy": "workspace:^0.20.0"
-    "@siteimprove/alfa-map": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0"
-    "@siteimprove/alfa-set": "workspace:^0.20.0"
-    "@siteimprove/alfa-style": "workspace:^0.20.0"
-    "@siteimprove/alfa-table": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0"
+    "@siteimprove/alfa-branched": "workspace:^0.19.0"
+    "@siteimprove/alfa-cache": "workspace:^0.19.0"
+    "@siteimprove/alfa-compatibility": "workspace:^0.19.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-graph": "workspace:^0.19.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-lazy": "workspace:^0.19.0"
+    "@siteimprove/alfa-map": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0"
+    "@siteimprove/alfa-set": "workspace:^0.19.0"
+    "@siteimprove/alfa-style": "workspace:^0.19.0"
+    "@siteimprove/alfa-table": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-array@workspace:^0.20.0, @siteimprove/alfa-array@workspace:packages/alfa-array":
+"@siteimprove/alfa-array@workspace:^0.19.0, @siteimprove/alfa-array@workspace:packages/alfa-array":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-array@workspace:packages/alfa-array"
   dependencies:
-    "@siteimprove/alfa-callback": "workspace:^0.20.0"
-    "@siteimprove/alfa-clone": "workspace:^0.20.0"
-    "@siteimprove/alfa-comparable": "workspace:^0.20.0"
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-hash": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-clone": "workspace:^0.19.0"
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-assert@workspace:^0.20.0, @siteimprove/alfa-assert@workspace:packages/alfa-assert":
+"@siteimprove/alfa-assert@workspace:^0.19.0, @siteimprove/alfa-assert@workspace:packages/alfa-assert":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-assert@workspace:packages/alfa-assert"
   dependencies:
-    "@siteimprove/alfa-act": "workspace:^0.20.0"
-    "@siteimprove/alfa-future": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0"
+    "@siteimprove/alfa-future": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-bits@workspace:^0.20.0, @siteimprove/alfa-bits@workspace:packages/alfa-bits":
+"@siteimprove/alfa-bits@workspace:^0.19.0, @siteimprove/alfa-bits@workspace:packages/alfa-bits":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-bits@workspace:packages/alfa-bits"
   dependencies:
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-branched@workspace:^0.20.0, @siteimprove/alfa-branched@workspace:packages/alfa-branched":
+"@siteimprove/alfa-branched@workspace:^0.19.0, @siteimprove/alfa-branched@workspace:packages/alfa-branched":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-branched@workspace:packages/alfa-branched"
   dependencies:
-    "@siteimprove/alfa-callback": "workspace:^0.20.0"
-    "@siteimprove/alfa-collection": "workspace:^0.20.0"
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-hash": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-list": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-collection": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-list": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-cache@workspace:^0.20.0, @siteimprove/alfa-cache@workspace:packages/alfa-cache":
+"@siteimprove/alfa-cache@workspace:^0.19.0, @siteimprove/alfa-cache@workspace:packages/alfa-cache":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-cache@workspace:packages/alfa-cache"
   dependencies:
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-callback@workspace:^0.20.0, @siteimprove/alfa-callback@workspace:packages/alfa-callback":
+"@siteimprove/alfa-callback@workspace:^0.19.0, @siteimprove/alfa-callback@workspace:packages/alfa-callback":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-callback@workspace:packages/alfa-callback"
   dependencies:
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-cascade@workspace:^0.20.0, @siteimprove/alfa-cascade@workspace:packages/alfa-cascade":
+"@siteimprove/alfa-cascade@workspace:^0.19.0, @siteimprove/alfa-cascade@workspace:packages/alfa-cascade":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-cascade@workspace:packages/alfa-cascade"
   dependencies:
-    "@siteimprove/alfa-cache": "workspace:^0.20.0"
-    "@siteimprove/alfa-comparable": "workspace:^0.20.0"
-    "@siteimprove/alfa-css": "workspace:^0.20.0"
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-media": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-selector": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-cache": "workspace:^0.19.0"
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0"
+    "@siteimprove/alfa-css": "workspace:^0.19.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-media": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-selector": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -1127,26 +1125,26 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-chai@workspace:packages/alfa-chai"
   dependencies:
-    "@siteimprove/alfa-act": "workspace:^0.20.0"
-    "@siteimprove/alfa-assert": "workspace:^0.20.0"
-    "@siteimprove/alfa-future": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0"
+    "@siteimprove/alfa-assert": "workspace:^0.19.0"
+    "@siteimprove/alfa-future": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
     "@types/chai": ^4.1.7
     chai: ^4.3.4
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-cheerio@workspace:^0.20.0, @siteimprove/alfa-cheerio@workspace:packages/alfa-cheerio":
+"@siteimprove/alfa-cheerio@workspace:^0.19.0, @siteimprove/alfa-cheerio@workspace:packages/alfa-cheerio":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-cheerio@workspace:packages/alfa-cheerio"
   dependencies:
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-http": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     "@types/node": ^14.14.37
     cheerio: ^1.0.0-rc.10
     domhandler: ^4.2.0
@@ -1157,27 +1155,27 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-cli@workspace:packages/alfa-cli"
   dependencies:
-    "@siteimprove/alfa-act": "workspace:^0.20.0"
-    "@siteimprove/alfa-cache": "workspace:^0.20.0"
-    "@siteimprove/alfa-command": "workspace:^0.20.0"
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-formatter": "workspace:^0.20.0"
-    "@siteimprove/alfa-formatter-earl": "workspace:^0.20.0"
-    "@siteimprove/alfa-formatter-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-future": "workspace:^0.20.0"
-    "@siteimprove/alfa-http": "workspace:^0.20.0"
-    "@siteimprove/alfa-interviewer": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
-    "@siteimprove/alfa-rules": "workspace:^0.20.0"
-    "@siteimprove/alfa-scraper": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-time": "workspace:^0.20.0"
-    "@siteimprove/alfa-url": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
-    "@siteimprove/alfa-xpath": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0"
+    "@siteimprove/alfa-cache": "workspace:^0.19.0"
+    "@siteimprove/alfa-command": "workspace:^0.19.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-formatter": "workspace:^0.19.0"
+    "@siteimprove/alfa-formatter-earl": "workspace:^0.19.0"
+    "@siteimprove/alfa-formatter-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-future": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-interviewer": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
+    "@siteimprove/alfa-rules": "workspace:^0.19.0"
+    "@siteimprove/alfa-scraper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-time": "workspace:^0.19.0"
+    "@siteimprove/alfa-url": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
+    "@siteimprove/alfa-xpath": "workspace:^0.19.0"
     "@types/node": ^14.14.31
     enquirer: ^2.3.6
   bin:
@@ -1185,84 +1183,84 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-clone@workspace:^0.20.0, @siteimprove/alfa-clone@workspace:packages/alfa-clone":
+"@siteimprove/alfa-clone@workspace:^0.19.0, @siteimprove/alfa-clone@workspace:packages/alfa-clone":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-clone@workspace:packages/alfa-clone"
   dependencies:
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-collection@workspace:^0.20.0, @siteimprove/alfa-collection@workspace:packages/alfa-collection":
+"@siteimprove/alfa-collection@workspace:^0.19.0, @siteimprove/alfa-collection@workspace:packages/alfa-collection":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-collection@workspace:packages/alfa-collection"
   dependencies:
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0"
-    "@siteimprove/alfa-callback": "workspace:^0.20.0"
-    "@siteimprove/alfa-comparable": "workspace:^0.20.0"
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-foldable": "workspace:^0.20.0"
-    "@siteimprove/alfa-functor": "workspace:^0.20.0"
-    "@siteimprove/alfa-hash": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-monad": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-applicative": "workspace:^0.19.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-foldable": "workspace:^0.19.0"
+    "@siteimprove/alfa-functor": "workspace:^0.19.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-monad": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-command@workspace:^0.20.0, @siteimprove/alfa-command@workspace:packages/alfa-command":
+"@siteimprove/alfa-command@workspace:^0.19.0, @siteimprove/alfa-command@workspace:packages/alfa-command":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-command@workspace:packages/alfa-command"
   dependencies:
-    "@siteimprove/alfa-functor": "workspace:^0.20.0"
-    "@siteimprove/alfa-highlight": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-parser": "workspace:^0.20.0"
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-functor": "workspace:^0.19.0"
+    "@siteimprove/alfa-highlight": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-parser": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-comparable@workspace:^0.20.0, @siteimprove/alfa-comparable@workspace:packages/alfa-comparable":
+"@siteimprove/alfa-comparable@workspace:^0.19.0, @siteimprove/alfa-comparable@workspace:packages/alfa-comparable":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-comparable@workspace:packages/alfa-comparable"
   dependencies:
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-compatibility@workspace:^0.20.0, @siteimprove/alfa-compatibility@workspace:packages/alfa-compatibility":
+"@siteimprove/alfa-compatibility@workspace:^0.19.0, @siteimprove/alfa-compatibility@workspace:packages/alfa-compatibility":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-compatibility@workspace:packages/alfa-compatibility"
   dependencies:
     "@mdn/browser-compat-data": ^3.1.3
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
     "@types/browserslist": ^4.4.0
     browserslist: ^4.16.6
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-continuation@workspace:^0.20.0, @siteimprove/alfa-continuation@workspace:packages/alfa-continuation":
+"@siteimprove/alfa-continuation@workspace:^0.19.0, @siteimprove/alfa-continuation@workspace:packages/alfa-continuation":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-continuation@workspace:packages/alfa-continuation"
   dependencies:
-    "@siteimprove/alfa-callback": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -1270,38 +1268,38 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-crawler@workspace:packages/alfa-crawler"
   dependencies:
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-frontier": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
-    "@siteimprove/alfa-scraper": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-url": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-frontier": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
+    "@siteimprove/alfa-scraper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-url": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-css@workspace:^0.20.0, @siteimprove/alfa-css@workspace:packages/alfa-css":
+"@siteimprove/alfa-css@workspace:^0.19.0, @siteimprove/alfa-css@workspace:packages/alfa-css":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-css@workspace:packages/alfa-css"
   dependencies:
-    "@siteimprove/alfa-array": "workspace:^0.20.0"
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-hash": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-math": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-parser": "workspace:^0.20.0"
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-record": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
-    "@siteimprove/alfa-slice": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-math": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-parser": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-record": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
+    "@siteimprove/alfa-slice": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -1309,99 +1307,98 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-cypress@workspace:packages/alfa-cypress"
   dependencies:
-    "@siteimprove/alfa-act": "workspace:^0.20.0"
-    "@siteimprove/alfa-assert": "workspace:^0.20.0"
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-formatter": "workspace:^0.20.0"
-    "@siteimprove/alfa-formatter-earl": "workspace:^0.20.0"
-    "@siteimprove/alfa-http": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0"
+    "@siteimprove/alfa-assert": "workspace:^0.19.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-formatter": "workspace:^0.19.0"
+    "@siteimprove/alfa-formatter-earl": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     cypress: ^7.5.0
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-device@workspace:^0.20.0, @siteimprove/alfa-device@workspace:packages/alfa-device":
+"@siteimprove/alfa-device@workspace:^0.19.0, @siteimprove/alfa-device@workspace:packages/alfa-device":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-device@workspace:packages/alfa-device"
   dependencies:
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-hash": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-map": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-map": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
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   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-dom@workspace:packages/alfa-dom"
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-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-lazy": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-sarif": "workspace:^0.20.0"
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-trampoline": "workspace:^0.20.0"
+    "@siteimprove/alfa-earl": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-lazy": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-sarif": "workspace:^0.19.0"
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-trampoline": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-earl@workspace:^0.20.0, @siteimprove/alfa-earl@workspace:packages/alfa-earl":
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   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-earl@workspace:packages/alfa-earl"
   dependencies:
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-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-json-ld": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-either@workspace:^0.20.0, @siteimprove/alfa-either@workspace:packages/alfa-either":
+"@siteimprove/alfa-either@workspace:^0.19.0, @siteimprove/alfa-either@workspace:packages/alfa-either":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-either@workspace:packages/alfa-either"
   dependencies:
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0"
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-foldable": "workspace:^0.20.0"
-    "@siteimprove/alfa-functor": "workspace:^0.20.0"
-    "@siteimprove/alfa-hash": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-monad": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-foldable": "workspace:^0.19.0"
+    "@siteimprove/alfa-functor": "workspace:^0.19.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-monad": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-emitter@workspace:^0.20.0, @siteimprove/alfa-emitter@workspace:packages/alfa-emitter":
+"@siteimprove/alfa-emitter@workspace:^0.19.0, @siteimprove/alfa-emitter@workspace:packages/alfa-emitter":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-emitter@workspace:packages/alfa-emitter"
   dependencies:
-    "@siteimprove/alfa-callback": "workspace:^0.20.0"
-    "@siteimprove/alfa-continuation": "workspace:^0.20.0"
-    "@siteimprove/alfa-functor": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-continuation": "workspace:^0.19.0"
+    "@siteimprove/alfa-functor": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-encoding@workspace:^0.20.0, @siteimprove/alfa-encoding@workspace:packages/alfa-encoding":
+"@siteimprove/alfa-encoding@workspace:^0.19.0, @siteimprove/alfa-encoding@workspace:packages/alfa-encoding":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-encoding@workspace:packages/alfa-encoding"
   dependencies:
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -1409,57 +1406,57 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-enzyme@workspace:packages/alfa-enzyme"
   dependencies:
-    "@siteimprove/alfa-react": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-react": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     "@types/enzyme": ^3.10.8
     enzyme: ^3.11.0
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-equatable@workspace:^0.20.0, @siteimprove/alfa-equatable@workspace:packages/alfa-equatable":
+"@siteimprove/alfa-equatable@workspace:^0.19.0, @siteimprove/alfa-equatable@workspace:packages/alfa-equatable":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-equatable@workspace:packages/alfa-equatable"
   dependencies:
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-fnv@workspace:^0.20.0, @siteimprove/alfa-fnv@workspace:packages/alfa-fnv":
+"@siteimprove/alfa-fnv@workspace:^0.19.0, @siteimprove/alfa-fnv@workspace:packages/alfa-fnv":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-fnv@workspace:packages/alfa-fnv"
   dependencies:
-    "@siteimprove/alfa-hash": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-foldable@workspace:^0.20.0, @siteimprove/alfa-foldable@workspace:packages/alfa-foldable":
+"@siteimprove/alfa-foldable@workspace:^0.19.0, @siteimprove/alfa-foldable@workspace:packages/alfa-foldable":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-foldable@workspace:packages/alfa-foldable"
   dependencies:
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-formatter-earl@workspace:^0.20.0, @siteimprove/alfa-formatter-earl@workspace:packages/alfa-formatter-earl":
+"@siteimprove/alfa-formatter-earl@workspace:^0.19.0, @siteimprove/alfa-formatter-earl@workspace:packages/alfa-formatter-earl":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-formatter-earl@workspace:packages/alfa-formatter-earl"
   dependencies:
-    "@siteimprove/alfa-earl": "workspace:^0.20.0"
-    "@siteimprove/alfa-formatter": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-earl": "workspace:^0.19.0"
+    "@siteimprove/alfa-formatter": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-formatter-json@workspace:^0.20.0, @siteimprove/alfa-formatter-json@workspace:packages/alfa-formatter-json":
+"@siteimprove/alfa-formatter-json@workspace:^0.19.0, @siteimprove/alfa-formatter-json@workspace:packages/alfa-formatter-json":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-formatter-json@workspace:packages/alfa-formatter-json"
   dependencies:
-    "@siteimprove/alfa-formatter": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-formatter": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -1467,59 +1464,59 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-formatter-sarif@workspace:packages/alfa-formatter-sarif"
   dependencies:
-    "@siteimprove/alfa-formatter": "workspace:^0.20.0"
-    "@siteimprove/alfa-sarif": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-formatter": "workspace:^0.19.0"
+    "@siteimprove/alfa-sarif": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-formatter@workspace:^0.20.0, @siteimprove/alfa-formatter@workspace:packages/alfa-formatter":
+"@siteimprove/alfa-formatter@workspace:^0.19.0, @siteimprove/alfa-formatter@workspace:packages/alfa-formatter":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-formatter@workspace:packages/alfa-formatter"
   dependencies:
-    "@siteimprove/alfa-act": "workspace:^0.20.0"
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0"
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-frontier@workspace:^0.20.0, @siteimprove/alfa-frontier@workspace:packages/alfa-frontier":
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   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-frontier@workspace:packages/alfa-frontier"
   dependencies:
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-url": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-url": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-functor@workspace:^0.20.0, @siteimprove/alfa-functor@workspace:packages/alfa-functor":
+"@siteimprove/alfa-functor@workspace:^0.19.0, @siteimprove/alfa-functor@workspace:packages/alfa-functor":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-functor@workspace:packages/alfa-functor"
   dependencies:
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-future@workspace:^0.20.0, @siteimprove/alfa-future@workspace:packages/alfa-future":
+"@siteimprove/alfa-future@workspace:^0.19.0, @siteimprove/alfa-future@workspace:packages/alfa-future":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-future@workspace:packages/alfa-future"
   dependencies:
-    "@siteimprove/alfa-applicative": "workspace:^0.20.0"
-    "@siteimprove/alfa-array": "workspace:^0.20.0"
-    "@siteimprove/alfa-callback": "workspace:^0.20.0"
-    "@siteimprove/alfa-continuation": "workspace:^0.20.0"
-    "@siteimprove/alfa-functor": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-monad": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-thenable": "workspace:^0.20.0"
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-applicative": "workspace:^0.19.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-continuation": "workspace:^0.19.0"
+    "@siteimprove/alfa-functor": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-monad": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-thenable": "workspace:^0.19.0"
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -1527,40 +1524,40 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-generator@workspace:packages/alfa-generator"
   dependencies:
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-graph@workspace:^0.20.0, @siteimprove/alfa-graph@workspace:packages/alfa-graph":
+"@siteimprove/alfa-graph@workspace:^0.19.0, @siteimprove/alfa-graph@workspace:packages/alfa-graph":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-graph@workspace:packages/alfa-graph"
   dependencies:
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-hash": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-map": "workspace:^0.20.0"
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0"
-    "@siteimprove/alfa-set": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-map": "workspace:^0.19.0"
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0"
+    "@siteimprove/alfa-set": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-hash@workspace:^0.20.0, @siteimprove/alfa-hash@workspace:packages/alfa-hash":
+"@siteimprove/alfa-hash@workspace:^0.19.0, @siteimprove/alfa-hash@workspace:packages/alfa-hash":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-hash@workspace:packages/alfa-hash"
   dependencies:
-    "@siteimprove/alfa-encoding": "workspace:^0.20.0"
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-encoding": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-highlight@workspace:^0.20.0, @siteimprove/alfa-highlight@workspace:packages/alfa-highlight":
+"@siteimprove/alfa-highlight@workspace:^0.19.0, @siteimprove/alfa-highlight@workspace:packages/alfa-highlight":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-highlight@workspace:packages/alfa-highlight"
   dependencies:
@@ -1568,63 +1565,63 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-http@workspace:^0.20.0, @siteimprove/alfa-http@workspace:packages/alfa-http":
+"@siteimprove/alfa-http@workspace:^0.19.0, @siteimprove/alfa-http@workspace:packages/alfa-http":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-http@workspace:packages/alfa-http"
   dependencies:
-    "@siteimprove/alfa-earl": "workspace:^0.20.0"
-    "@siteimprove/alfa-encoding": "workspace:^0.20.0"
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-map": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-url": "workspace:^0.20.0"
+    "@siteimprove/alfa-earl": "workspace:^0.19.0"
+    "@siteimprove/alfa-encoding": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-map": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-url": "workspace:^0.19.0"
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+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0"
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+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
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@@ -1632,12 +1629,12 @@ __metadata:
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   resolution: "@siteimprove/alfa-jasmine@workspace:packages/alfa-jasmine"
   dependencies:
-    "@siteimprove/alfa-act": "workspace:^0.20.0"
-    "@siteimprove/alfa-assert": "workspace:^0.20.0"
-    "@siteimprove/alfa-future": "workspace:^0.20.0"
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-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0"
+    "@siteimprove/alfa-assert": "workspace:^0.19.0"
+    "@siteimprove/alfa-future": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     "@types/jasmine": ^3.3.12
     jasmine: ^3.7.0
   languageName: unknown
@@ -1647,12 +1644,12 @@ __metadata:
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   resolution: "@siteimprove/alfa-jest@workspace:packages/alfa-jest"
   dependencies:
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-    "@siteimprove/alfa-assert": "workspace:^0.20.0"
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-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0"
+    "@siteimprove/alfa-assert": "workspace:^0.19.0"
+    "@siteimprove/alfa-future": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     "@types/jest": ^26.0.10
     jest: ^27.0.4
   languageName: unknown
@@ -1662,141 +1659,138 @@ __metadata:
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   resolution: "@siteimprove/alfa-jquery@workspace:packages/alfa-jquery"
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-    "@siteimprove/alfa-http": "workspace:^0.20.0"
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-    "@siteimprove/alfa-test": "workspace:^0.20.0"
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+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
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     jquery: ^3.6.0
   languageName: unknown
   linkType: soft
 
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-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
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-"@siteimprove/alfa-lazy@workspace:^0.20.0, @siteimprove/alfa-lazy@workspace:packages/alfa-lazy":
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+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-parser": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
+    "@siteimprove/alfa-slice": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
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-"@siteimprove/alfa-monad@workspace:^0.20.0, @siteimprove/alfa-monad@workspace:packages/alfa-monad":
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   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-monad@workspace:packages/alfa-monad"
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-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
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+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
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@@ -1804,62 +1798,62 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-network@workspace:packages/alfa-network"
   dependencies:
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-    "@siteimprove/alfa-set": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-graph": "workspace:^0.19.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
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-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-applicative": "workspace:^0.19.0"
+    "@siteimprove/alfa-comparable": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-foldable": "workspace:^0.19.0"
+    "@siteimprove/alfa-functor": "workspace:^0.19.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-monad": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-parser@workspace:^0.20.0, @siteimprove/alfa-parser@workspace:packages/alfa-parser":
+"@siteimprove/alfa-parser@workspace:^0.19.0, @siteimprove/alfa-parser@workspace:packages/alfa-parser":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-parser@workspace:packages/alfa-parser"
   dependencies:
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-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-performance@workspace:^0.20.0, @siteimprove/alfa-performance@workspace:packages/alfa-performance":
+"@siteimprove/alfa-performance@workspace:^0.19.0, @siteimprove/alfa-performance@workspace:packages/alfa-performance":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-performance@workspace:packages/alfa-performance"
   dependencies:
-    "@siteimprove/alfa-callback": "workspace:^0.20.0"
-    "@siteimprove/alfa-emitter": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-emitter": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -1867,36 +1861,36 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-playwright@workspace:packages/alfa-playwright"
   dependencies:
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-http": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     "@types/node": ^14.14.31
     playwright: ^1.12.1
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-predicate@workspace:^0.20.0, @siteimprove/alfa-predicate@workspace:packages/alfa-predicate":
+"@siteimprove/alfa-predicate@workspace:^0.19.0, @siteimprove/alfa-predicate@workspace:packages/alfa-predicate":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-predicate@workspace:packages/alfa-predicate"
   dependencies:
-    "@siteimprove/alfa-callback": "workspace:^0.20.0"
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-promise@workspace:^0.20.0, @siteimprove/alfa-promise@workspace:packages/alfa-promise":
+"@siteimprove/alfa-promise@workspace:^0.19.0, @siteimprove/alfa-promise@workspace:packages/alfa-promise":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-promise@workspace:packages/alfa-promise"
   dependencies:
-    "@siteimprove/alfa-array": "workspace:^0.20.0"
-    "@siteimprove/alfa-callback": "workspace:^0.20.0"
-    "@siteimprove/alfa-continuation": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-continuation": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -1904,40 +1898,40 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-protractor@workspace:packages/alfa-protractor"
   dependencies:
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-http": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     protractor: ^7.0.0
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-puppeteer@workspace:^0.20.0, @siteimprove/alfa-puppeteer@workspace:packages/alfa-puppeteer":
+"@siteimprove/alfa-puppeteer@workspace:^0.19.0, @siteimprove/alfa-puppeteer@workspace:packages/alfa-puppeteer":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-puppeteer@workspace:packages/alfa-puppeteer"
   dependencies:
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-http": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     puppeteer: ^10.0.0
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-react@workspace:^0.20.0, @siteimprove/alfa-react@workspace:packages/alfa-react":
+"@siteimprove/alfa-react@workspace:^0.19.0, @siteimprove/alfa-react@workspace:packages/alfa-react":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-react@workspace:packages/alfa-react"
   dependencies:
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-http": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     "@types/react": ^17.0.0
     "@types/react-test-renderer": ^17.0.0
     react: ^17.0.2
@@ -1945,136 +1939,136 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-record@workspace:^0.20.0, @siteimprove/alfa-record@workspace:packages/alfa-record":
+"@siteimprove/alfa-record@workspace:^0.19.0, @siteimprove/alfa-record@workspace:packages/alfa-record":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-record@workspace:packages/alfa-record"
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-    "@siteimprove/alfa-foldable": "workspace:^0.20.0"
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-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-list": "workspace:^0.20.0"
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-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-foldable": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-list": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-reducer@workspace:^0.20.0, @siteimprove/alfa-reducer@workspace:packages/alfa-reducer":
+"@siteimprove/alfa-reducer@workspace:^0.19.0, @siteimprove/alfa-reducer@workspace:packages/alfa-reducer":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-reducer@workspace:packages/alfa-reducer"
   dependencies:
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-refinement@workspace:^0.20.0, @siteimprove/alfa-refinement@workspace:packages/alfa-refinement":
+"@siteimprove/alfa-refinement@workspace:^0.19.0, @siteimprove/alfa-refinement@workspace:packages/alfa-refinement":
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   resolution: "@siteimprove/alfa-refinement@workspace:packages/alfa-refinement"
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-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
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-"@siteimprove/alfa-result@workspace:^0.20.0, @siteimprove/alfa-result@workspace:packages/alfa-result":
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   resolution: "@siteimprove/alfa-result@workspace:packages/alfa-result"
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-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
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+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-foldable": "workspace:^0.19.0"
+    "@siteimprove/alfa-functor": "workspace:^0.19.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
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+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
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   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-rules@workspace:^0.20.0, @siteimprove/alfa-rules@workspace:packages/alfa-rules":
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   resolution: "@siteimprove/alfa-rules@workspace:packages/alfa-rules"
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-    "@siteimprove/alfa-aria": "workspace:^0.20.0"
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-    "@siteimprove/alfa-url": "workspace:^0.20.0"
-    "@siteimprove/alfa-wcag": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0"
+    "@siteimprove/alfa-affine": "workspace:^0.19.0"
+    "@siteimprove/alfa-aria": "workspace:^0.19.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0"
+    "@siteimprove/alfa-branched": "workspace:^0.19.0"
+    "@siteimprove/alfa-cache": "workspace:^0.19.0"
+    "@siteimprove/alfa-compatibility": "workspace:^0.19.0"
+    "@siteimprove/alfa-css": "workspace:^0.19.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-earl": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-future": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-iana": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-list": "workspace:^0.19.0"
+    "@siteimprove/alfa-map": "workspace:^0.19.0"
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+    "@siteimprove/alfa-media": "workspace:^0.19.0"
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+    "@siteimprove/alfa-sarif": "workspace:^0.19.0"
+    "@siteimprove/alfa-selector": "workspace:^0.19.0"
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0"
+    "@siteimprove/alfa-set": "workspace:^0.19.0"
+    "@siteimprove/alfa-style": "workspace:^0.19.0"
+    "@siteimprove/alfa-table": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
+    "@siteimprove/alfa-trilean": "workspace:^0.19.0"
+    "@siteimprove/alfa-url": "workspace:^0.19.0"
+    "@siteimprove/alfa-wcag": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-sarif@workspace:^0.20.0, @siteimprove/alfa-sarif@workspace:packages/alfa-sarif":
+"@siteimprove/alfa-sarif@workspace:^0.19.0, @siteimprove/alfa-sarif@workspace:packages/alfa-sarif":
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   resolution: "@siteimprove/alfa-sarif@workspace:packages/alfa-sarif"
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+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
     "@types/sarif": ^2.1.3
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@@ -2083,216 +2077,214 @@ __metadata:
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-    "@siteimprove/alfa-array": "workspace:^0.20.0"
-    "@siteimprove/alfa-callback": "workspace:^0.20.0"
-    "@siteimprove/alfa-foldable": "workspace:^0.20.0"
-    "@siteimprove/alfa-functor": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-monad": "workspace:^0.20.0"
-    "@siteimprove/alfa-reducer": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-thunk": "workspace:^0.20.0"
+    "@siteimprove/alfa-applicative": "workspace:^0.19.0"
+    "@siteimprove/alfa-array": "workspace:^0.19.0"
+    "@siteimprove/alfa-callback": "workspace:^0.19.0"
+    "@siteimprove/alfa-foldable": "workspace:^0.19.0"
+    "@siteimprove/alfa-functor": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-monad": "workspace:^0.19.0"
+    "@siteimprove/alfa-reducer": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-thunk": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-trilean@workspace:^0.20.0, @siteimprove/alfa-trilean@workspace:packages/alfa-trilean":
+"@siteimprove/alfa-trilean@workspace:^0.19.0, @siteimprove/alfa-trilean@workspace:packages/alfa-trilean":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-trilean@workspace:packages/alfa-trilean"
   dependencies:
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -2300,28 +2292,28 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-unexpected@workspace:packages/alfa-unexpected"
   dependencies:
-    "@siteimprove/alfa-act": "workspace:^0.20.0"
-    "@siteimprove/alfa-assert": "workspace:^0.20.0"
-    "@siteimprove/alfa-future": "workspace:^0.20.0"
-    "@siteimprove/alfa-mapper": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0"
+    "@siteimprove/alfa-assert": "workspace:^0.19.0"
+    "@siteimprove/alfa-future": "workspace:^0.19.0"
+    "@siteimprove/alfa-mapper": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     unexpected: ^12.0.3
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-url@workspace:^0.20.0, @siteimprove/alfa-url@workspace:packages/alfa-url":
+"@siteimprove/alfa-url@workspace:^0.19.0, @siteimprove/alfa-url@workspace:packages/alfa-url":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-url@workspace:packages/alfa-url"
   dependencies:
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-hash": "workspace:^0.20.0"
-    "@siteimprove/alfa-iterable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
-    "@siteimprove/alfa-sequence": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-hash": "workspace:^0.19.0"
+    "@siteimprove/alfa-iterable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
+    "@siteimprove/alfa-sequence": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -2329,44 +2321,44 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-vue@workspace:packages/alfa-vue"
   dependencies:
-    "@siteimprove/alfa-cheerio": "workspace:^0.20.0"
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-http": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-cheerio": "workspace:^0.19.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     "@vue/test-utils": ^1.0.0-beta.29
     vue: ^2.6.14
     vue-template-compiler: ^2.6.14
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-wcag@workspace:^0.20.0, @siteimprove/alfa-wcag@workspace:packages/alfa-wcag":
+"@siteimprove/alfa-wcag@workspace:^0.19.0, @siteimprove/alfa-wcag@workspace:packages/alfa-wcag":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-wcag@workspace:packages/alfa-wcag"
   dependencies:
-    "@siteimprove/alfa-act": "workspace:^0.20.0"
-    "@siteimprove/alfa-branched": "workspace:^0.20.0"
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-act": "workspace:^0.19.0"
+    "@siteimprove/alfa-branched": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-web@workspace:^0.20.0, @siteimprove/alfa-web@workspace:packages/alfa-web":
+"@siteimprove/alfa-web@workspace:^0.19.0, @siteimprove/alfa-web@workspace:packages/alfa-web":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-web@workspace:packages/alfa-web"
   dependencies:
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-earl": "workspace:^0.20.0"
-    "@siteimprove/alfa-encoding": "workspace:^0.20.0"
-    "@siteimprove/alfa-graph": "workspace:^0.20.0"
-    "@siteimprove/alfa-http": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-sarif": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-earl": "workspace:^0.19.0"
+    "@siteimprove/alfa-encoding": "workspace:^0.19.0"
+    "@siteimprove/alfa-graph": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-sarif": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -2374,29 +2366,29 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-webdriver@workspace:packages/alfa-webdriver"
   dependencies:
-    "@siteimprove/alfa-device": "workspace:^0.20.0"
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-http": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
-    "@siteimprove/alfa-web": "workspace:^0.20.0"
+    "@siteimprove/alfa-device": "workspace:^0.19.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-http": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
+    "@siteimprove/alfa-web": "workspace:^0.19.0"
     webdriverio: ^7.7.3
   languageName: unknown
   linkType: soft
 
-"@siteimprove/alfa-xpath@workspace:^0.20.0, @siteimprove/alfa-xpath@workspace:packages/alfa-xpath":
+"@siteimprove/alfa-xpath@workspace:^0.19.0, @siteimprove/alfa-xpath@workspace:packages/alfa-xpath":
   version: 0.0.0-use.local
   resolution: "@siteimprove/alfa-xpath@workspace:packages/alfa-xpath"
   dependencies:
-    "@siteimprove/alfa-dom": "workspace:^0.20.0"
-    "@siteimprove/alfa-equatable": "workspace:^0.20.0"
-    "@siteimprove/alfa-json": "workspace:^0.20.0"
-    "@siteimprove/alfa-option": "workspace:^0.20.0"
-    "@siteimprove/alfa-parser": "workspace:^0.20.0"
-    "@siteimprove/alfa-predicate": "workspace:^0.20.0"
-    "@siteimprove/alfa-refinement": "workspace:^0.20.0"
-    "@siteimprove/alfa-result": "workspace:^0.20.0"
-    "@siteimprove/alfa-slice": "workspace:^0.20.0"
-    "@siteimprove/alfa-test": "workspace:^0.20.0"
+    "@siteimprove/alfa-dom": "workspace:^0.19.0"
+    "@siteimprove/alfa-equatable": "workspace:^0.19.0"
+    "@siteimprove/alfa-json": "workspace:^0.19.0"
+    "@siteimprove/alfa-option": "workspace:^0.19.0"
+    "@siteimprove/alfa-parser": "workspace:^0.19.0"
+    "@siteimprove/alfa-predicate": "workspace:^0.19.0"
+    "@siteimprove/alfa-refinement": "workspace:^0.19.0"
+    "@siteimprove/alfa-result": "workspace:^0.19.0"
+    "@siteimprove/alfa-slice": "workspace:^0.19.0"
+    "@siteimprove/alfa-test": "workspace:^0.19.0"
   languageName: unknown
   linkType: soft
 
@@ -2413,7 +2405,7 @@ __metadata:
     execa: ^5.1.1
     minimist: ^1.2.5
     prettier: ^2.3.1
-    typescript: ^4.3.5
+    typescript: ^4.3.2
   languageName: unknown
   linkType: soft
 
@@ -9047,23 +9039,23 @@ resolve@~1.19.0:
   languageName: node
   linkType: hard
 
-"typescript@^4.3.5, typescript@~4.3.2":
-  version: 4.3.5
-  resolution: "typescript@npm:4.3.5"
+"typescript@^4.3.2, typescript@~4.3.2":
+  version: 4.3.4
+  resolution: "typescript@npm:4.3.4"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: bab033b5e2b0790dd35b77fd005df976ef80b8d84fd2c6e63cc31808151875beae9216e5a315fe7068e8499905c3c354248fe83272cdfc13b7705635f0c66c97
+  checksum: 75e1f2769c7ff38c718523d05eaf1c2611dbf92c0ab0f85f603ead9bb23416af2009a5dac46e76ef6a207a8508fa53f51b43a41f2a91b1241b53cd744c16128c
   languageName: node
   linkType: hard
 
-"typescript@patch:typescript@^4.3.5#~builtin<compat/typescript>, typescript@patch:typescript@~4.3.2#~builtin<compat/typescript>":
-  version: 4.3.5
-  resolution: "typescript@patch:typescript@npm%3A4.3.5#~builtin<compat/typescript>::version=4.3.5&hash=34ad7d"
+"typescript@patch:typescript@^4.3.2#~builtin<compat/typescript>, typescript@patch:typescript@~4.3.2#~builtin<compat/typescript>":
+  version: 4.3.4
+  resolution: "typescript@patch:typescript@npm%3A4.3.4#~builtin<compat/typescript>::version=4.3.4&hash=34ad7d"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: 94acb9409712c7073eaecb328cf9be872e4882c62d991cc3d9b53d59f4844d72afbf75818471e086bfb26c444e3a411667a9517f2be2518f8be95bab9fa50ae9
+  checksum: 3b9d89d6d34162316668a4c1eff51451d5387447d33e9608d526fbd3eb1b8bcf370a134a3546a6e4b429e76855cbf61374d17245612643dd74e7ae0cf29ca299
   languageName: node
   linkType: hard