Antti Haapala added the comment:

I am very negative to this idea. Correct code in Python **2** would either set 
`__hash__ = None` or redefine `__hash__` in *any* class that defines `__eq__`. 
That it just wasn't used like that is no excuse.

This warning is even more important if even Ned Batchelder could have a bug 
like that in his code.

It will break as soon as someone "realizes" that "hey I can use a set to remove 
duplicates in my container".

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nosy: +ztane

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28263>
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