Re: [streams] Byte stream update, including reference implementation (#361)

> +  const stream = controller._controlledReadableByteStream;
> +
> +  if (typeof pullIntoFunction !== 'function') {
> +    DestroyReadableByteStreamController(controller);
> +    ErrorReadableByteStream(stream, new TypeError('pullInto property of an underlying byte source must be a function'));
> +    return;
> +  }
> +
> +  assert(controller._pendingPullIntos.length > 0);
> +  const pullIntoDescriptor = controller._pendingPullIntos[0];
> +
> +  controller._callPullOrPullIntoLaterIfNeeded = false;
> +  controller._insideUnderlyingByteSource = true;
> +
> +  try {
> +    pullIntoFunction.apply(source, [pullIntoDescriptor.buffer,

Changed to Uint8Array on e187dbf9d506fad2f9094f0710fe9045c3b82f00

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