[issue36887] Add integer square root, math.isqrt

[Serhiy Storchaka]

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

I am wondering whether int(sqrt(float(n))) can be used as a good initial approximation.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36887>
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