William Pickard <lollol22...@gmail.com> added the comment:

Another thing to note Raymond, as I stated before, example C is, from an 
external context, is a plain property object who's "fget" attribute is an 
instance of whatever "lru_cache" returns.

isinstance won't be able to differentiate between example "a" and "c" without 
checking "fget"

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41523>
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