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

[Mark Dickinson]

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

Yes, I'm interested in seeing the pure Python version.  It could go into test_math, and would be a useful form of documentation.

Are there sufficient tests already in test_math.py to exercise the code thoroughly, or are more needed?

I'll try to find time to do a thorough code review in the next few days.

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