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The ``__args__`` of the parameterized generics for :data:`typing.Callable`
and :class:`collections.abc.Callable` are now consistent. The ``__args__``
for :class:`collections.abc.Callable` are now flattened while
:data:`typing.Callable`'s have not changed. To allow this change,
:class:`types.GenericAlias` can now be subclassed and
``collections.abc.Callable``'s ``__class_getitem__`` will now return a subclass
of ``types.GenericAlias``. Tests for typing were also updated to not subclass
things like ``Callable[..., T]`` as that is not a valid base class. Finally,
both ``Callable``\ s no longer validate their ``argtypes``, in
``Callable[[argtypes], resulttype]`` to prepare for :pep:`612`. Patch by Ken Jin.
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