[issue46611] Improve coverage of `__instancecheck__` and `__subclasscheck__` methods in `typing.py`

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Thanks Nikita.

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components: +Tests -Library (Lib)
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.10

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<https://bugs.python.org/issue46611>
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