[issue14521] math.copysign(1., float('nan')) returns -1.

[Mark Dickinson]

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

> May be it would be more reasonable if math.copysign(1., float('nan')) 
> return a float('nan')?

-1.  That would go against all the existing standards.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14521>
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