[issue43420] Optimize rational arithmetics

[Raymond Hettinger]

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

The cost to the common case for small components is about 20%:

$ python3.10 -m timeit -r11 -s 'from fractions import Fraction as F' -s 'a=F(10,3)' -s 'b=F(6, 5)' 'a * b'
200000 loops, best of 11: 1.8 usec per loop

$ python3.10 -m timeit -r11 -s 'from patched import Fraction as F' -s 'a=F(10,3)' -s 'b=F(6, 5)' 'a * b'
100000 loops, best of 11: 2.14 usec per loop

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