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

[umedoblock]

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

sorry.
I fix my bug.

but this patch contain new fail...

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

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Added file: http://bugs.python.org/file22251/math_copysign.patch

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