[issue46622] Support decorating a coroutine with functools.cached_property

[Éric Araujo]

Change by Éric Araujo <merwok at netwok.org>:


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versions:  -Python 3.10, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46622>
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