Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

There are some side effects of setting _name. In 3.9:

>>> class X(Annotated[int, (1, 10)]): pass
... 
>>> X.__mro__
(<class '__main__.X'>, <class 'int'>, <class 'object'>)

In 3.10:

>>> class X(Annotated[int, (1, 10)]): pass
... 
>>> X.__mro__
(<class '__main__.X'>, <class 'int'>, <class 'typing.Generic'>, <class 
'object'>)

Now a subclass of an Annotated alias is a generic type. Should it be?

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44524>
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