`_UnpackAlias` `__class__` attribute

[Viicos]

Is there a reason to have the __class__ attribute of the _UnpackAlias class set to typing.TypeVar?

typing_extensions/src/typing_extensions.py

Lines 2659 to 2660 in 3f47bf9

	class _UnpackAlias(typing._GenericAlias, _root=True):
	__class__ = typing.TypeVar

It doesn't seem to be present on typing.

[Daraan]

This is a needed for <3.11 when e.g. using class Bar(Generic[typing_extensions.Unpack[Ts]]) to be compatible with <3.11 typing isinstance(typing_extensions.Unpack[...], TypeVar) check during Generic.__class_getitem__.

I think for 3.11 we could safely remove the changed attribute from the backport.

[Viicos]

Thanks, that clarifies it!