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

> +  if (controller._totalQueuedBytes === 0) {
> +    // TODO: Detach buffer.
> +    controller._pendingPullIntos.push(pullIntoDescriptor);
> +
> +    if (controller._insideUnderlyingByteSource) {
> +      controller._callPullOrPullIntoLaterIfNeeded = true;
> +      return;
> +    }
> +
> +    CallPullInto(controller);
> +    CallPullOrPullIntoRepeatedlyIfNeeded(controller);
> +
> +    return;
> +  }
> +
> +  const ready = FillPullIntoDescriptorFromQueue(controller, pullIntoDescriptor);

We could. I've written these functions separately for each context than an all-in-one function that switches its behavior by checking various conditions, and it turned out it's easier to code.

I've moved asserts to simplify the code a little on a4f9a2848ce5d70725a56a7d61ec2e521c903336

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