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

> +    return;
> +  }
> +
> +  const stream = controller._controlledReadableByteStream;
> +
> +  if (typeof pullFunction !== 'function') {
> +    DestroyReadableByteStreamController(controller);
> +    ErrorReadableByteStream(stream, new TypeError('pull property of an underlying byte source must be a function'));
> +    return;
> +  }
> +
> +  controller._callPullOrPullIntoLaterIfNeeded = false;
> +  controller._insideUnderlyingByteSource = true;
> +
> +  try {
> +    pullFunction.apply(source);

Nit: more idiomatic to use `.call`

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