Re: [whatwg/streams] Permitting transferable stream optimisation (#1124)

Note: Since this discussion is being referenced in an argument around the standardization of the Breakout Box API that Chrome has shipped, it would be good if people other than Jan-Ivar and I could chime in.

My position is still that the two ends of a stream that is surfaced as a ReadableStream need to be considered differently; the transfer of a ReadableStream transfers the consumer end; it does nothing to change where the origin of the stream is attached, and any attachment of the origin to the originating context should not be assumed by default, but specified by the specification of that particular source type.

In particular, transferring a stream of video frames from a native source such as a camera should not mandate any interaction between the originating context and the stream of video frames. (For cameras and microphones, there is a binding to the context where these streams originate by virtue of the fact that permission to use is bound to the originating context, so when that context goes away, the streams end. This is orthogonal to the question being raised here.)


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