[issue8692] Use divide-and-conquer for faster factorials

[Daniel Stutzbach]

Daniel Stutzbach <daniel at stutzbachenterprises.com> added the comment:

It's a little too clever though.  It gives the wrong answer for 29!.

I'll have a revised version of my patch done sometime tomorrow.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8692>
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