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

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Should it take variable number of positional arguments or a single iterable argument as max() and min()?

What should it return for 0 arguments?

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<https://bugs.python.org/issue39648>
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