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Add usage note.
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@ -49,8 +49,9 @@ The :mod:`functools` module defines the following functions:
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Since a dictionary is used to cache results, the positional and keyword
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arguments to the function must be hashable.
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If *maxsize* is set to None, the LRU feature is disabled and the cache
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can grow without bound.
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If *maxsize* is set to None, the LRU feature is disabled and the cache can
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grow without bound. The LRU feature performs best when *maxsize* is a
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power-of-two.
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If *typed* is set to True, function arguments of different types will be
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cached separately. For example, ``f(3)`` and ``f(3.0)`` will be treated
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