Sourced from typing-extensions's changelog.

Release 4.6.1 (May 23, 2023)

• Change deprecated @runtime to formal API @runtime_checkable in the error message. Patch by Xuehai Pan.
• Fix regression in 4.6.0 where attempting to define a Protocol that was generic over a ParamSpec or a TypeVarTuple would cause TypeError to be raised. Patch by Alex Waygood.

Release 4.6.0 (May 22, 2023)

• typing_extensions is now documented at https://typing-extensions.readthedocs.io/en/latest/. Patch by Jelle Zijlstra.

• Add typing_extensions.Buffer, a marker class for buffer types, as proposed by PEP 688. Equivalent to collections.abc.Buffer in Python 3.12. Patch by Jelle Zijlstra.

• Backport two CPython PRs fixing various issues with typing.Literal: python/cpython#23294 and python/cpython#23383. Both CPython PRs were originally by Yurii Karabas, and both were backported to Python >=3.9.1, but no earlier. Patch by Alex Waygood.

  A side effect of one of the changes is that equality comparisons of Literal objects will now raise a TypeError if one of the Literal objects being compared has a mutable parameter. (Using mutable parameters with Literal is not supported by PEP 586 or by any major static type checkers.)

• Literal is now reimplemented on all Python versions <= 3.10.0. The typing_extensions version does not suffer from the bug that was fixed in python/cpython#29334. (The CPython bugfix was backported to CPython 3.10.1 and 3.9.8, but no earlier.)

• Backport CPython PR 26067 (originally by Yurii Karabas), ensuring that isinstance() calls on protocols raise TypeError when the protocol is not decorated with @runtime_checkable. Patch by Alex Waygood.

• Backport several significant performance improvements to runtime-checkable protocols that have been made in Python 3.12 (see python/cpython#74690 for details). Patch by Alex Waygood.

  A side effect of one of the performance improvements is that the members of a runtime-checkable protocol are now considered “frozen” at runtime as soon as the class has been created. Monkey-patching attributes onto a runtime-checkable protocol will still work, but will have no impact on isinstance() checks comparing objects to the protocol. See "What's New in Python 3.12" for more details.

• isinstance() checks against runtime-checkable protocols now use inspect.getattr_static() rather than hasattr() to lookup whether attributes exist (backporting python/cpython#103034). This means that descriptors and __getattr__ methods are no longer unexpectedly evaluated during isinstance() checks against runtime-checkable

... (truncated)

• f62fa3f Prepare release 4.6.1 (#186)
• 88a7f68 Have Protocol inherit from typing.Generic on 3.8+ (#184)
• b306e56 Clarify error message for non @runtime_checkable decorated protocols (#178)
• 356934c Prepare release 4.6.0 (#177)
• 8054a29 Further simplify the implementations of the TypeVarLikes (#176)
• 773090f Remove module assignment for TypeVar and friends (#175)
• bbfd0cc Extend docs intro (#168)
• 88be907 Improve the repr() of _marker (#174)
• 9648c6f add infer_variance for ParamSpec (#172)
• f2fc4cb Add references to additional known limitations (#171)
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