See
http://mail.python.org/pipermail/python-dev/2009-February/085809.html
where Nick Coghlan writes:
"I'm wondering if Mark should add the exception he recently removed back
in as a Deprecation Warning when tp_compare is defined, but
tp_richcompare is not. Such a warning should also be present when
running with -3 in 2.7 (assuming it isn't already there)."
A technical difficulty with adding this warning is that various built-in
types implement tp_compare but not tp_richcompare. For example: int,
long, slice, buffer, instancemethod, cell and bool all do this.
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