Shantanu <hauntsani...@gmail.com> added the comment:

As I mentioned in the post, bpo-45081 actually makes this issue worse, since we 
get a RecursionError.

I think `TypeError: Protocols cannot be instantiated` is probably okay 
behaviour (as opposed to RecursionError), more just unfortunate that it seems 
to be an unanticipated breaking change.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45121>
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