diff --git a/.changeset/nice-shirts-switch.md b/.changeset/nice-shirts-switch.md
new file mode 100644
index 00000000..2f0239c2
--- /dev/null
+++ b/.changeset/nice-shirts-switch.md
@@ -0,0 +1,5 @@
+---
+"@khanacademy/wonder-stuff-core": patch
+---
+
+Broaden typing for keys/values/entries methods
diff --git a/packages/wonder-stuff-core/src/__tests__/entries.flowtest.js b/packages/wonder-stuff-core/src/__tests__/entries.flowtest.js
index da5cfa0c..10faa8e5 100644
--- a/packages/wonder-stuff-core/src/__tests__/entries.flowtest.js
+++ b/packages/wonder-stuff-core/src/__tests__/entries.flowtest.js
@@ -51,3 +51,15 @@ import {entries} from "../entries.js";
     // $FlowExpectedError[incompatible-type]
     const [___, ____]: [string, number] = entries1[0];
 }
+
+{
+    // should work with class instances
+    class Foo {
+        a: string;
+        b: string;
+    }
+    const foo = new Foo();
+
+    // This should not be erroring.
+    const _ = entries(foo);
+}
diff --git a/packages/wonder-stuff-core/src/__tests__/keys.flowtest.js b/packages/wonder-stuff-core/src/__tests__/keys.flowtest.js
index accb40f6..14f95d13 100644
--- a/packages/wonder-stuff-core/src/__tests__/keys.flowtest.js
+++ b/packages/wonder-stuff-core/src/__tests__/keys.flowtest.js
@@ -43,3 +43,15 @@ import {keys} from "../keys.js";
     // This should not be erroring.
     const _ = keys(obj3);
 }
+
+{
+    // should work with class instances
+    class Foo {
+        a: string;
+        b: string;
+    }
+    const foo = new Foo();
+
+    // This should not be erroring.
+    const _ = keys(foo);
+}
diff --git a/packages/wonder-stuff-core/src/__tests__/values.flowtest.js b/packages/wonder-stuff-core/src/__tests__/values.flowtest.js
index f232e55a..86198551 100644
--- a/packages/wonder-stuff-core/src/__tests__/values.flowtest.js
+++ b/packages/wonder-stuff-core/src/__tests__/values.flowtest.js
@@ -58,3 +58,15 @@ import {values} from "../values.js";
     // $FlowExpectedError[incompatible-call]
     const __ = values<number>(obj2);
 }
+
+{
+    // should work with class instances
+    class Foo {
+        a: string;
+        b: string;
+    }
+    const foo = new Foo();
+
+    // This should not be erroring.
+    const _ = values(foo);
+}
diff --git a/packages/wonder-stuff-core/src/entries.js b/packages/wonder-stuff-core/src/entries.js
index 584b7cbd..f6f05a7c 100644
--- a/packages/wonder-stuff-core/src/entries.js
+++ b/packages/wonder-stuff-core/src/entries.js
@@ -2,11 +2,13 @@
 /**
  * Return an array of key/value tuples for an object.
  *
- * @param {$ReadOnly<{[K]: V}>} obj The object for which the values are
+ * @param {$ReadOnly<interface {[K]: V}>} obj The object for which the values are
  * to be returned.
  * @returns {Array<[K, V]>} An array of key/value tuples for the object.
  */
-export function entries<K, V>(obj: $ReadOnly<{[K]: V}>): Array<[K, V]> {
+export function entries<K, V>(
+    obj: $ReadOnly<interface {[K]: V}>,
+): Array<[K, V]> {
     // This cast is deliberate as Object.entries is typed to return
     // Array<[string, mixed]>, but we want to return Array<[K, V]>.
     // $FlowIgnore[unclear-type]
diff --git a/packages/wonder-stuff-core/src/keys.js b/packages/wonder-stuff-core/src/keys.js
index 201f616c..19a18423 100644
--- a/packages/wonder-stuff-core/src/keys.js
+++ b/packages/wonder-stuff-core/src/keys.js
@@ -2,10 +2,12 @@
 /**
  * Return an array of the enumerable keys of an object.
  *
- * @param {$ReadOnly<{[string]: mixed}>} obj The object for which the values are
+ * @param {$ReadOnly<interface {[string]: mixed}>} obj The object for which the values are
  * to be returned.
  * @returns {Array<$Keys<O>>} An array of the enumerable keys of an object.
  */
-export function keys<O: {[string]: mixed}>(obj: $ReadOnly<O>): Array<$Keys<O>> {
+export function keys<O: interface {[string]: mixed}>(
+    obj: $ReadOnly<O>,
+): Array<$Keys<O>> {
     return Object.keys(obj);
 }
diff --git a/packages/wonder-stuff-core/src/values.js b/packages/wonder-stuff-core/src/values.js
index 72f84b5c..73401dad 100644
--- a/packages/wonder-stuff-core/src/values.js
+++ b/packages/wonder-stuff-core/src/values.js
@@ -2,11 +2,11 @@
 /**
  * Return an array of the enumerable property values of an object.
  *
- * @param {$ReadOnly<{[mixed]: V}>} obj The object for which the values are
+ * @param {$ReadOnly<interface {[mixed]: V}>} obj The object for which the values are
  * to be returned.
  * @returns {Array<V>} An array of the enumerable property values of the object.
  */
-export function values<V>(obj: $ReadOnly<{|[mixed]: V|}>): Array<V> {
+export function values<V>(obj: $ReadOnly<interface {[mixed]: V}>): Array<V> {
     // This is a deliberate cast through any.
     // Object.values returns Array<mixed> and we want to return Array<V>.
     // $FlowIgnore[unclear-type]