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

That's true. Well, I guess the other approach we have here is:

- Keep the existing logic to throw TypeError if body is a ReadableStream.
- Add **new** step in `HTTP-network-or-cache fetch` after we obtain `contentLengthValue`, which checks that the size is less than the ~UA-set size for requests with keepalive flag set. If the condition doesn't hold, return a network error.

~section 5.5, step 7:

> If `contentLengthValue` is non-null, the `httpRequest`'s keepalive flag is set, and `contentLengthValue` is greater than the UA-set maximum body size for such requests, return a network error. 

WDYT?

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