[issue1762] Inheriting from ABCs makes classes slower.

[Jeffrey Yasskin]

Jeffrey Yasskin added the comment:

Right. Decimal was just the place I noticed the problem first. Now it
affects Rational more, but it's really a problem with ABCs in general,
not specific concrete classes.

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title: Inheriting from ABC slows Decimal down. -> Inheriting from ABCs makes classes slower.

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