[issue4998] __slots__ on Fraction is useless

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Thanks for the patch, Raymond.

I'm don't really have any experience with ABCs.  I've read the PEP (a few 
times), but am not convinced that I fully understand all the ideas 
involved.

What are the practical differences between having Fraction inherit from 
Rational directly, and registering Fraction as a subclass of Rational?

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