[issue39648] Update math.gcd() to accept "n" arguments.

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

What's slightly more interesting is the return value for a single argument  `a`, where we should be careful to return `abs(a)` rather than simply `a`.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39648>
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