Correct details regarding nav sort order

Gemfile.lock

@@ -70,7 +70,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.6)
-    rouge (4.1.2)
+    rouge (4.1.3)
     safe_yaml (1.0.5)
     sass-embedded (1.64.1-arm64-darwin)
       google-protobuf (~> 3.23)

_config.yml

@@ -49,6 +49,8 @@ enable_copy_code_button: true
 #     block:
 #       line_numbers: true
 
+# nav_sort: case_insensitive
+
 collections_dir: collections
 
 collections:

collections/_navigation/order/mixture/index.md

@@ -9,23 +9,21 @@ has_children: true
 
 It seems unlikely that different types of `nav_order` values are needed for the children of the same parent.
 
-1.  Check that the titles of the children of this page are shown in the order:
+1.  Check that the titles of the children of this page are shown in the order:[^1]
     ```
     -1.1
     -1
     0.0
     0
     2.2222
     10.0
+    Aa
+    aa
     2
     10
     A
-    Aa
-    aa
     ```
+
+----
 
-    {: .note }
-    The default order of numeric titles depends on which version of Jekyll is used
-    to build the site: 
-    the default build on GitHub Pages uses Jekyll 3.9 and gives lexicographic order,
-    but when using Jekyll 4, `2` precedes `10`. ❌
+[^1]: When using Jekyll 3.9, the string `"10"` comes before `"2"`.

collections/_navigation/order/strings/b.md

@@ -0,0 +1,15 @@
+---
+title: B
+nav_order: B
+parent: Strings
+grand_parent: Order
+---
+
+# B
+
+```yaml
+title: B
+nav_order: B
+parent: Strings
+grand_parent: Order
+```

collections/_navigation/order/strings/index.md

@@ -7,15 +7,27 @@ has_children: true
 
 # String Order
 
-By default, all Capital letters come before all lowercase letters; you can add `nav_sort: case_insensitive` in the configuration file to ignore the case).
+By default, digits precede letters, numeric strings are sorted by value,[^1]
+and all Capital letters come before all lowercase letters.
 
-Digits precede letters, and numeric titles are ordered lexicographically: `"10"` precedes `"2"` (in contrast to explicit numeric `nav_order` values).
+When you add `nav_sort: case_insensitive` in the configuration file, `"aa"` precedes `"B"`,
+and numeric strings are ordered lexicographically: `"10"` precedes `"2"`.
+
+1.  Check that `_config.yml` contains:
+    ```yaml
+    nav_sort: {{ site.nav_sort }}
+    ```
 
 1.  Check that the titles of the children of this page are shown in the order:
     ```
-    10
     2
+    10
     A
     Aa
+    B
     aa
     ```
+
+----
+
+[^1]: When using Jekyll 3.9, numeric strings are always sorted lexicographically.