[docs] [issue33774] Document that @lru_cache caches based on exactly how the function arguments are specified

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Agreed that this should be documented.

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nosy: +r.david.murray, rhettinger
stage:  -> needs patch
title: Improve doc of @lru_cache to avoid misuse and confusion -> Document that @lru_cache caches based on exactly how the function arguments are specified
versions: +Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33774>
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