Re: [streams] Add readableAmount getter to ReadableByteStream (#279)

Even in the new async read() byte stream Domenic is working on at https://github.com/whatwg/streams/pull/296, you can call `reader.read(view)` with view whose size equals to the number of bytes you want to get to read only what you want.

Kindly hold!

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https://github.com/whatwg/streams/pull/279#issuecomment-81432091