[issue2235] __eq__ / __hash__ check doesn't take inheritance into account

[Guido van Rossum]

Guido van Rossum added the comment:

The py3k feature was intentional.

I'm not sure who did the backport (could've been me, long ago).  I think
the backport should be replaced with a warning that is only issued when
-3 is given.

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<http://bugs.python.org/issue2235>
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