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Tue Mar 30 16:11:31 EST 2004 · https://mail.python.org/pipermail/python-dev/2004-March/043729.html

Version 2.215 (Mar 21, 2004) of object.c assumes that
identity implies equality.

I won't rehash the discussion about custom objects and NaN.
I do think the decision should be reasonably consistent.
The current CVS version shortcuts for == and !=, but not 
for the other operators.

Normally, 

	x == y implies 
		x <= y
		x >= y
		not x < y
		not x > y 
(in addition to)
		not x != y

I think any object that intentionally violates these rules 
is likely to also violate the (is implies ==) assumption.

-jJ

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