[issue16832] Expose cache validity checking support in ABCMeta

[Éric Araujo]

Éric Araujo added the comment:

About future-proofing: do we want to document that the token is an opaque integer (as is done now) or just an opaque object that supports equality comparisons?

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nosy: +eric.araujo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16832>
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