[issue40114] support maxsize argument for lru_cache's user_function option

[brendon zhang]

brendon zhang <brendon-zhang at hotmail.com> added the comment:

Two concerns is

1. the method signature (inspect.signature(lru_cache)) is not (maxsize=128, typed=False) anymore, and so it is poor documentation.
2. not good reuse of TypeErrors related to incorrect number of inputs / type of inputs.

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<https://bugs.python.org/issue40114>
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