Re: [whatwg/fetch] Uploading a Request made from a ReadableStream body (#425)

> However, I don't understand why https://fetch.spec.whatwg.org/#concept-http-network-or-cache-fetch should continue to clone. The whole reason we have additional checks is that we can be more conservative there.

As concept body has the body data as a ReadableStream, we need to clone it to replay uploading regardless of the source data type (String, ArrayBuffer, ReadableStream, ...). There are some options I could think of to handle this issue:

1. Stop holding the body data as a ReadableStream.
2. Define a new concept, say "replayable stream", to handle replaying
3. Keep teeing, but adding a flag to forbid user-visible teeing to allow implementers to omit teeing.

I chose the last option as it looked easiest.

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