Re: [whatwg/fetch] Use a ReadableStream with byte source (formerly called ReadableByteStream) for .body (#267)

How will `Request.clone()` and `Response.clone()` work? Currently, to [clone a body](https://fetch.spec.whatwg.org/#concept-body-clone), we [tee](https://streams.spec.whatwg.org/#readablestream-tee) the body's stream. But teeing always returns two *regular* streams, i.e. non-byte streams. It looks like we first need to define how to tee a readable byte stream into two new readable byte streams.

This might also affect other parts of the specification. For example, in [this suggestion on #1144](https://github.com/whatwg/fetch/pull/1144#discussion_r573692785), we'd also want to clone a `Request`.

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