4.7.0rc1

This is a pre-release; please test it! 4.7.0 final is expected in one week (June 28).

Changelog:

• Add typing_extensions.get_protocol_members and
  typing_extensions.is_protocol (backport of CPython PR #104878).
  Patch by Jelle Zijlstra.
• typing_extensions now re-exports all names in the standard library's
  typing module, except the deprecated ByteString. Patch by Jelle
  Zijlstra.
• Due to changes in the implementation of typing_extensions.Protocol,
  typing.runtime_checkable can now be used on typing_extensions.Protocol
  (previously, users had to use typing_extensions.runtime_checkable if they
  were using typing_extensions.Protocol).
• Align the implementation of TypedDict with the implementation in the
  standard library on Python 3.9 and higher.
  typing_extensions.TypedDict is now a function instead of a class. The
  private functions _check_fails, _dict_new, and _typeddict_new
  have been removed. is_typeddict now returns False when called with
  TypedDict itself as the argument. Patch by Jelle Zijlstra.
• Declare support for Python 3.12. Patch by Jelle Zijlstra.
• Fix tests on Python 3.13, which removes support for creating
  TypedDict classes through the keyword-argument syntax. Patch by
  Jelle Zijlstra.
• Fix a regression introduced in v4.6.3 that meant that
  issubclass(object, typing_extensions.Protocol) would erroneously raise
  TypeError. Patch by Alex Waygood (backporting the CPython PR
  python/cpython#105239).
• Allow Protocol classes to inherit from typing_extensions.Buffer or
  collections.abc.Buffer. Patch by Alex Waygood (backporting
  python/cpython#104827, by Jelle Zijlstra).
• Allow classes to inherit from both typing.Protocol and typing_extensions.Protocol
  simultaneously. Since v4.6.0, this caused TypeError to be raised due to a
  metaclass conflict. Patch by Alex Waygood.
• Backport several deprecations from CPython relating to unusual ways to
  create TypedDicts and NamedTuples. CPython PRs #105609 and #105780
  by Alex Waygood; typing_extensions backport by Jelle Zijlstra.
  • Creating a NamedTuple using the functional syntax with keyword arguments
    (NT = NamedTuple("NT", a=int)) is now deprecated.
  • Creating a NamedTuple with zero fields using the syntax NT = NamedTuple("NT")
    or NT = NamedTuple("NT", None) is now deprecated.
  • Creating a TypedDict with zero fields using the syntax TD = TypedDict("TD")
    or TD = TypedDict("TD", None) is now deprecated.
• Fix bug on Python 3.7 where a protocol X that had a member a would not be
  considered an implicit subclass of an unrelated protocol Y that only has a
  member a. Where the members of X are a superset of the members of Y,
  X should always be considered a subclass of Y iff Y is a
  runtime-checkable protocol that only has callable members. Patch by Alex
  Waygood (backporting CPython PR
  python/cpython#105835).