[issue38565] Expose the value passed of typed passed to functools.lru_cache

[Manjusaka]

Manjusaka <lizheao940510 at gmail.com> added the comment:

I think to modify in lru_cache should be good in normal circumstance

But here's maybe some people modify the wrapped object that underlying in  lru_cache

So I prefer to add a new function in _functools.c?

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<https://bugs.python.org/issue38565>
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