lib.types: add release notes

Author: hsjobeki

nixos/doc/manual/redirects.json

@@ -1844,6 +1844,12 @@
   "sec-release-25.05-notable-changes": [
     "release-notes.html#sec-release-25.05-notable-changes"
   ],
+  "sec-release-25.05-lib": [
+    "release-notes.html#sec-release-25.05-lib"
+  ],
+  "sec-release-25.05-lib-breaking": [
+    "release-notes.html#sec-release-25.05-lib-breaking"
+  ],
   "sec-release-24.11": [
     "release-notes.html#sec-release-24.11"
   ],

nixos/doc/manual/release-notes/rl-2505.section.md

@@ -118,3 +118,11 @@
 - `bind.cacheNetworks` now only controls access for recursive queries, where it previously controlled access for all queries.
 
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
+
+## Nixpkgs Library {#sec-release-25.05-lib}
+
+### Breaking changes {#sec-release-25.05-lib-breaking}
+
+- Structure of the `functor` of some types has changed. `functor` is an implementation detail and should not be relied upon. If you did rely on it let us know in this [PR](https://github.com/NixOS/nixpkgs/pull/363565).
+  - [`lib.types.enum`](https://nixos.org/manual/nixos/unstable/#sec-option-types-basic): Previously the `functor.payload` was the list of enum values directly. Now it is an attribute set containing the values in the `values` attribute.
+  - [`lib.types.separatedString`](https://nixos.org/manual/nixos/unstable/#sec-option-types-string): Previously the `functor.payload` was the seperator directly. Now it is an attribute set containing the seperator in the `sep` attribute.