Mark Dickinson added the comment:

> but 0*inf and inf-inf return values with the same representation as 
> float('-nan'), not float('nan')

Right: that's because Intel's "default" NaN (i.e., the float it produces as a 
result of any invalid operation) has its sign bit set.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23185>
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