[issue36887] Add integer square root, math.isqrt

[Serhiy Storchaka]

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

+1, but I propose to add it to the new imath module and move also factorial() and gcd() to it. New binomial() or comb() function (issue35431) should be added in imath too.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue36887>
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