[issue2325] isinstance(anything, MetaclassThatDefinesInstancecheck) raises instead of returning False

[Pedro Werneck]

Pedro Werneck <pjwerneck at gmail.com> added the comment:

Seems like that's the wrong usage and the PEP 3119 notices that it's
hard to get the right semantics. To use it that way you need to define
the methods as a classmethod().

http://www.python.org/dev/peps/pep-3119/#one-trick-ponies

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