[issue36887] Add integer square root, math.isqrt

[Serhiy Storchaka]

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

> I'd spell that as `1 + isqrt(n - 1)`.

Could you please add this in the documentation?

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