Re: [whatwg/fetch] "construct a ReadableStream object" doesn't specify the realm (#730)

@annevk Is there a case where a stream is created that could never be observable by Javascript? My impression is that's easier to get the realm right at creation time than try to patch it up later when Javascript looks at it.

The thing that worries me more than realms is Promises. The standard makes extensive use of Promises for asynchronicity, and in principle they're not visible to Javascript and so don't need to be on a thread that runs Javascript, but JS is slippery and what is and isn't observable is hard to pin down.

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