[issue45665] Problems caused by isinstance(list[int], type) returning True

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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dependencies:  -functools' singledispatch does not support GenericAlias

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45665>
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