[issue36881] isinstance raises TypeError for metaclass with metaclass=ABCMeta

[Ivan Levkivskyi]

Ivan Levkivskyi <levkivskyi at gmail.com> added the comment:

I think this is related to how `__subclasscheck__` is implemented in `ABCMeta`. I just checked this also happens in Python 3.6 (i.e. it is not something specific to the C version introduced in Python 3.7).

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<https://bugs.python.org/issue36881>
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