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

> @@ -971,6 +978,16 @@ an assert).
>    1. Return *true*.
>  </emu-alg>
>  
> +<h4 id="is-readable-stream-disturbed" aoid="IsReadableStreamDisturbed">IsReadableStreamDisturbed ( stream )</h4>
> +
> +This abstract operation is meant to be called from other specifications that may wish to query whether or not a

"...readable stream has ever been read from or canceled"

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