[issue33018] Improve issubclass() error checking and message

[Alexey Izbyshev]

Alexey Izbyshev <izbyshev at ispras.ru> added the comment:

ABC.register() has an explicit check, and it is mentioned in PEP 3119. The point here is not to change issubclass(), but to change ABC.__subclasscheck__(). It may conceivably have stricter requirements than issubclass() has. But certainly an advice from actual ABC users would be nice.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33018>
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