[issue1762] Inheriting from ABCs makes classes slower.

[Jeffrey Yasskin]

Jeffrey Yasskin added the comment:

Guido and I discussed this, and the next step seems to be to rewrite
_Abstract in C and push it into object. For an idea of how much that'll
help, just commenting out _Abstract.__new__ takes the Fraction()
constructor from 9.35us to 6.7us on my box, and the C we need (a new
flag on the class) should run very quickly.

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