[issue34498] Python 3.7 breaks on singledispatch_function.register(pseudo_type), which Python 3.6 accepted

[Michał Radwański]

Michał Radwański <lisklusow...@gmail.com> added the comment:

The change is not only in the added `isinstance` check:

~ $ python3.6 -q
>>> import typing
>>> isinstance(typing.Sequence, type)
True
>>>
~ $ python3.7 -q
>>> import typing
>>> isinstance(typing.Sequence, type)
False
>>>

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nosy: +enedil

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<https://bugs.python.org/issue34498>
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