Serhiy Storchaka added the comment:

Perhaps following technique can be used to prevent object's life prolongation:

def spam(self, *args, **kwargs):
    @lru_cache(maxsize=20)
    def spam(foo, bar=1, *, baz=None):
        ...
    self.spam = spam
    return self.spam(*args, **kwargs)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19859>
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