[issue46622] Support decorating a coroutine with functools.cached_property

[Tzu-ping Chung]

Tzu-ping Chung <uranusjr at gmail.com> added the comment:

I agree that `print(await a.hello)` does look awkward, although I know some would disagree. (Context: I submitted this BPO after a colleague of mine at $WORK pointed out the behavioural difference between `functools` and `cached_property to me.)

Personally I’d feel this more natural:

class Foo:
    @functools.cache
    async def go(self):
        print(1)

async def main():
    foo = Foo()
    await foo.go()
    await foo.go()

Although now I just noticed this actually does not work either.

Perhaps we should fix this instead and add a line in the documentation under cached_property to point people to the correct path?

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<https://bugs.python.org/issue46622>
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