[issue12211] math.copysign must keep object type.

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

"Except when explicitly noted otherwise, all return values are floats."

On the other hand, copysign says "return x with the sign of y", which certainly sounds like it is preserving x, not creating a new float.  So at the least there is a doc issue, I think.

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nosy: +r.david.murray

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