Re: [fetch] specify types of streams (#167)

@wanderview Yes, I wanted to say that we are not going to guarantee that any chunk read from the body stream is of type Uint8Array.

Note that we state any chunk read from the body stream created by the user agent is of type Uint8Array. Also, as Domenic says, DOM consumers expect Uint8Array chunks and they will fail if that expectation is not satisfied.

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