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

In the particular case we are concerned about (cameras etc), the underlying source has a strong link with the originating realm, and is stopped on context destruction, but runs on a different execution thread.

I read the behavior that we'll be observing with transferable streams from cameras/microphones opened in the originating realm (a Window) to be conformant with the current spec (stream ends when source ends). But this is not necessarily true for all usages of transferable streams.

Note: Non-native (shimmed) streams are, as far as I understand, impossible to make transferable, so the fact that their behavior doesn't match the spec for transferable streams doesn't matter.

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