Re: [whatwg/fetch] (WIP) allow Request to outlive environment settings object (#388)

> The problem is that the concept layer also depends on ReadableStream. Even when you create a Request object from a DOMString body, the body is held as a ReadableStream (see https://fetch.spec.whatwg.org/#concept-body and https://fetch.spec.whatwg.org/#concept-bodyinit-extract).

I thought one of the goals was to let the browser optimize such that if it never has to execute js to read the stream, then it could perform off thread copying, etc.  A DOMString body should fall into this category, no?

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