[issue16832] Expose cache validity checking support in ABCMeta

[Roundup Robot]

Roundup Robot added the comment:

New changeset a9f73b44ea0e by R David Murray in branch 'default':
#16832: s/integer/object/ in docs/docstring, and add whatsnew entry.
http://hg.python.org/cpython/rev/a9f73b44ea0e

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