[issue41458] Avoid overflow/underflow in math.prod()

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

I attached a file with latest (and more tested) recipe.  The underflow test was fixed: "not total and old_total and x".  Also, the final call to math.prod() was in-lined so that I could time it with PyPy.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41458>
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