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

[umedoblock]

Changes by umedoblock <umedoblock at gmail.com>:


Added file: http://bugs.python.org/file22250/math_copysign.patch

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12211>
_______________________________________