Bug Fix: Fixed bug in type inference of dictionary, list and set expressions when they contain classes or class instances that are apparently the same type but internally appear different because they are "pseudo-generic". Pseudo-generic classes are those that have no type annotations in the __init__ method and are treated internally as generics to improve type inference.
Bug Fix: Fixed bug that caused false positive error when assigning Type[Any] to type.
Bug Fix: Fixed false positive error when assignment expression (i.e. walrus operator) is used within a class scope.
Enhancement: Updated typeshed stubs to the latest.
Behavior Change: When in "outputjson" mode, the CLI now output log information to stderr.
Enhancement: Add match and case keywords to completion provider.
Bug Fix: Fixed regression that caused runtime assertion (and crash) in some rare circumstances.
Performance: Eliminated O(n*m) behavior when testing type compatibility of a union with n subtypes and a union of m subtypes when those subtypes contain mostly literals.
Performance: Moved checks for string literal errors (unsupported escape characters, etc.) from binder to checker for performance reasons.
Performance: Improved performance of string token value unescape logic by handling the common cases (no format string and no escape characters) using a fast path.
Bug Fix (from Pylance): Fixed bug in file watching logic for config files.
Performance (from Pylance): Reduced work done during parsing and binding related to doc string handling.
Enhancement (from Pylance): Improved document symbol provider symbol type information.
Behavior Change: Removed PEP 563 (deferred type annotation) behavior as default for Python 3.10, since the PEP was deferred.
Bug Fix: Fixed bug in completion provider that caused completions to be provided when pressing "." within the string literal portion of an f-string.
Performance (from Pylance): Provided special-case code paths in parser and binder to speed up symbol indexing operations.