Merge pull request #52 from wolph/fix/unique-list-membership

Keep UniqueList, the casted dicts and SliceableDeque consistent

Author: wolph

CHANGELOG.md

@@ -1,5 +1,32 @@
 # Changelog
 
+## Unreleased
+
+- Keep `UniqueList` membership in sync when replacing an indexed item, and
+  leave membership unchanged when the index is out of range, contributed by
+  @shkyyy18 in PR #51.
+- Keep `UniqueList` membership in sync for slice assignment, `extend`, `pop`,
+  `remove`, `clear`, `+=` and `*=`, so `extend` and `+=` no longer add
+  duplicates and removed values can be added again.
+- Accept one-shot iterables in `UniqueList` slice assignment, allow a slice to
+  reuse the values it replaces, and reject a slice that repeats a value.
+- Make `copy.copy` and `copy.deepcopy` of a `UniqueList` return a working copy
+  with its own membership.
+- Leave `UniqueList` membership unchanged when `insert` fails, and answer `in`
+  for an unhashable value the way a `list` does.
+- Make `CastedDict` and `LazyCastedDict` load from `pickle` on every protocol,
+  including pickles written by 4.0.1, and stop `copy.copy` and `copy.deepcopy`
+  from casting the stored values a second time.
+- Cast what `setdefault` and `|=` store in a `CastedDict` or `LazyCastedDict`.
+  A `None` default is stored as it is.
+- Cast the key of a `LazyCastedDict` once when it is stored. It was cast twice.
+- Let keyword arguments win over the mapping in `update` and the constructor
+  of the casted dicts, as `dict` does.
+- Make `!=` the opposite of `==` for `SliceableDeque`, and compare unequal to a
+  set when an item is unhashable.
+- Remove the iterable of mappings from the `DictUpdateArgs` type alias. The
+  code never accepted that shape.
+
 ## 4.0.1 - 2026-08-30
 
 - Allow `uv_build` 0.12.x, contributed by @felixonmars in PR #49.