[issue22486] Add math.gcd()

[Stefan Behnel]

Stefan Behnel added the comment:

The problem is that this changes the behaviour of fractions.gcd() w.r.t. negative numbers.  It's a public function, so we should keep it for backwards compatibility reasons, *especially* when adding a new function in the math module.

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components:  -Extension Modules
type: enhancement -> performance

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22486>
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