Author mark.dickinson
Recipients barry, christian.heimes, gvanrossum, mark.dickinson, mikecurtis, rhettinger
Date 2008-11-11.13:58:01
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> Taking it out probably had something to do with NaNs, but this
> discussion needs to avoid getting lost in NaN paradoxes and instead
> focus on a notion of membership that is ALWAYS true given object
> identity.  This is an essential pragmatism necessary for reasoning 
> programs.

I agree wholeheartedly.  NaN comparison weirdness isn't anywhere near
important enough to justify breaking these invariants.  Though I imagine 
that if 'x == x' started returning True for NaNs there might be some 

> P.S.  Mark, those Py2.6 invariants are not still true in Py3.0:

You're right, of course.
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