Re: [fetch] Introduce Response.body. (#118) (#128)

> +
> + <li><p>If <var>stream</var> is null, set <var>stream</var> to an
> + <span title=concept-empty-ReadableStream>empty ReadableStream</span>.
> +
> + <li><p>Let <var>reader</var> be the result of <span title=concept-get-reader>getting</span>
> + a reader from <var>stream</var>. If that threw an exception, return a new promise rejected
> + with that exception.
> +
> + <li><p>Let <var>promise</var> be the result of
> + <span title=concept-read-all-bytes-from-ReadableStream>reading</span> all bytes from
> + <var>stream</var> with <var>reader</var>.
> +
> + <li><p>Return the result of transforming <var>promise</var> by a fulfillment handler that
> + returns the result of the <span title=concept-body-package-data>package data</span> algorithm
> + with its first argument, <var>type</var> and <span title=concept-body-mime-type>MIME type</span>.
> +</ol>

I don't really understand what transforming a promise means. @domenic?

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