[issue44606] Discrepancy between isinstance() and issubclass() for union types

[Serhiy Storchaka]

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

PR 27120 fixes __instancecheck__ and __subclasscheck__. Converting None to 
type(None) will be done in other PR.

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<https://bugs.python.org/issue44606>
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