[issue12211] Better document math.copysign behavior.

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> I think we should include the "On a platform ..."

Sure, sounds good.  One of the main things that makes copysign useful is that it distinguishes between -0.0 and 0.0.

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<http://bugs.python.org/issue12211>
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