relocate changes relevant to plugin authors

Author: Bahex

blog/2025-10-14-nushell_v0_108_0.md

@@ -916,18 +916,6 @@ Error: nu::parser::invalid_binary_string
 - Introduced flag `--time-zone` to `polars as-datetime`
 - Introduced flag `--time-unit` to `polars as-datetime`
 
-### Allow saving `CustomValue`s ([#16692])
-> TODO(release-notes): Move this into plugin authors section.
-
-`CustomValue` now supports a `save` method. Implementors can use it to make their values savable to disk.
-
-### Add `run pr` and `download pr` to `toolkit` ([#16770])
-The toolkit in the Nushell repository can now download and run PRs by downloading artifacts from CI runs. It can be run like this:
-```nushell
-use toolkit
-toolkit run pr <number>
-```
-
 ### Additional changes
 
 * The `which` command now lists all commands (internal and external) when no argument is passed to it ([#16551])
@@ -1079,6 +1067,21 @@ This was due to a miscompilation bug, which is now fixed.
 
 # Notes for plugin developers
 
+### Allow saving `CustomValue`s ([#16692])
+`CustomValue` now supports a `save` method. Implementors can use it to make their values savable to disk.
+
+### Add `run pr` and `download pr` to `toolkit` ([#16770])
+The toolkit in the Nushell repository can now download and run PRs by downloading artifacts from CI runs. It can be run like this:
+```nushell
+use toolkit
+toolkit run pr <number>
+```
+
+### Pass optional and casing to follow path methods for `CustomValue` ([#16736])
+Plugin authors that use `CustomValue` can now access the `optional` and `casing` fields in their `follow_path_int` and `follow_path_string` methods to add behavior for optional access or case sensitivity.
+
+This is a breaking change for the plugin signature so it needs an update. Simply ignoring these fields may be a valid solution.
+
 # Hall of fame
 
 Thanks to all the contributors below for helping us solve issues, improve documentation, refactor code, and more! :pray: