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Tue May 25 12:30:38 EDT 2004 · http://mail.python.org/pipermail/python-dev/2004-May/044960.html

Gustavo Niemeyer: <niemeyer at conectiva.com>

> Looking again, this is true for any operation, not only
> Py_EQ or Py_NE.

CVS has previously restricted the shortcut to those two,
but I agree it should be all or nothing.

Even unordered objects normally compare equal to themselves;
if "is" does not imply "__eq__", then we are by definition 
dealing with an exceptional case.  (NaN, or SQL NULL, or DUMMY,
or ...)  Since different exceptional cases will have different
rules, it might be reasonable to ask the creator to use a custom
comparison function.  They will often have to do this anyway.

Instead of 
	if (a == b):

they can write
	if (a is not NULL) and (a == b):
or
	if (a == b) and (not isNaN(a)):

-jJ

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