[issue24483] Avoid repeated hash calculation in C implementation of functools.lru_cache()

[Raymond Hettinger]

Raymond Hettinger added the comment:

I would like the full functionality of the Python version to be implemented.   Guaranteeing that the hash is only calculated once prevents a reentrancy hole and provides a speed benefit as well.  Please implement exactly what the pure python version does (no more than one call to hash ever).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24483>
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