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

Raymond Hettinger report at bugs.python.org
Tue Jun 5 21:07:13 EDT 2018

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

Sure, I can add a line mentioning that distinct argument patterns may be considered as distinct cache entries even though they otherwise seem to be equivalent calls.  That will just be a general statement though. 
The specific details are implementation dependent, have changed over time, and may change again in the future.

assignee: docs at python -> rhettinger
priority: normal -> low

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