[docs] [issue12211] Better document math.copysign behavior.

A.M. Kuchling report at bugs.python.org
Sun Feb 16 17:26:15 CET 2014

A.M. Kuchling added the comment:

Actually ISTM the 'if x is NaN' sentence can also go; it seems to just copy the sign bit no matter what x and y are.

>>> from math import *
>>> nan = float('nan')
>>> neg = -nan
>>> copysign(+1, copysign(nan, neg))


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