[issue43420] Optimize rational arithmetics

[Raymond Hettinger]

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

> 1 loop, best of 11: 257 msec per loop
> $ ... from patched ...
> 10 loops, best of 11: 33.2 msec per loop

Looks worth it :-)

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<https://bugs.python.org/issue43420>
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