[issue16832] Expose cache validity checking support in ABCMeta

[Nick Coghlan]

Nick Coghlan added the comment:

Trading correctness for speed is almost never a good idea. If people are worried about speed to that level, they can either bypass the public API and access the private attribute directly (after profiling their application to ensure the cache validity checks are the bottleneck), or else migrate to PyPy to eliminate the function call overhead (amongst many other speed improvements).

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