Add a minor `Fraction.hash()` optimization (GH-15313)

* Add a minor `Fraction.__hash__` optimization that got lost in the shuffle.

Document the optimizations.

Tim Peters committed 6y ago

29bb227a0ce6d355a2b3e5d6a25872e3702ba9bb

Parent: 0567786

Committed by GitHub <noreply@github.com> on 8/17/2019, 2:09:16 AM

Add a minor `Fraction.__hash__()` optimization (GH-15313)