Re: [streams] Add IsReadableStreamDisturbed predicate (#385)

I think it is also unlikely that we break things.

Our current implementation is also based on closed/errored so it would mean to change our current implementation, which I'm not a big fan of but it wouldn't be a big change either, so I'm against but only barely and based on laziness :)

What I would do is securing the change of behavior if it happens with some tests ensuring that everything is as it should be and not as it was.

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