[docs] [issue12211] math.copysign must keep object type.

[umedoblock]

umedoblock <umedoblock at gmail.com> added the comment:

I made the patch.
But it cannot pass testCopysign().

math.copysign(1, -0.)
returns 1.

I hope to return -1.
But I don't know how to realize -0. as negative value.

Please help me.

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components: +Library (Lib) -Documentation
keywords: +patch
versions:  -Python 2.7, Python 3.3
Added file: http://bugs.python.org/file22249/math_copysign.patch

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