Kevin Shweh <kevin.sh...@gmail.com> added the comment:
It seems like the straightforward, minimal fix would be to just add
if (getattr(cls, '_is_protocol', False) and
not getattr(cls, '_is_runtime_protocol', False) and
not _allow_reckless_class_cheks()):
raise TypeError(...)
to _ProtocolMeta.__instancecheck__. Does that fail on some edge case (that the
current implementation works on)? It's a little weird that
_ProtocolMeta.__instancecheck__ doesn't explicitly check that the protocol is
runtime-checkable.
----------
nosy: +Kevin Shweh
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38908>
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