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Amaury's patch doesn't currently remove the new-in-2.6 code that turns
"tp_hash = NULL" at the C level into "__hash__ = None" at the Python
level. I suspect that will prove to be a problem (and may be the cause
of Django's woes, if I remember Glyph's python-dev posts correctly). I
also don't believe the new TPSLOT entries should be necessary - we
should be able to just revert all of this tp_hash related code to match
the 2.5 implementation, and then see if we can find a way to emit the
Py3k warning when __cmp__ or __eq__ are overridden without overriding
__hash__ without breaking any existing code (if we can't, we may have to
figure out a way to get 2to3 to check for it).
P.S. you'd think I would have learnt by now not to try to make sense of
typeobject.c when I'm tired ;)