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@@ -268,6 +268,11 @@ Library
- Issue #26873: xmlrpc now raises ResponseError on unsupported type tags
instead of silently return incorrect result.
+- Issue #26915: The __contains__ methods in the collections ABCs now check
+ for identity before checking equality. This better matches the behavior
+ of the concrete classes, allows sensible handling of NaNs, and makes it
+ easier to reason about container invariants.
+
- Issue #26711: Fixed the comparison of plistlib.Data with other types.
- Issue #24114: Fix an uninitialized variable in `ctypes.util`.