[issue43420] Optimize rational arithmetics

[Sergey B Kirpichev]

Sergey B Kirpichev <skirpichev at gmail.com> added the comment:

> I'll have to see if the slowdown can be mitigated somehow.

Yes, for small components this is a known slowdown.  I'm trying to mitigate that case in https://github.com/python/cpython/pull/25518.  Except for the mixed mode (Fraction's+int) - this match the original performance.

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