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

> +      DetachReadableByteStreamReader(reader);
> +
> +      return;
> +    }
> +
> +    pullIntoDescriptor.bytesFilled += bytesWritten;
> +
> +    if (pullIntoDescriptor.bytesFilled >= pullIntoDescriptor.elementSize) {
> +      this._pendingPullIntos.shift();
> +
> +      let remainder;
> +      if (pullIntoDescriptor.bytesFilled % pullIntoDescriptor.elementSize > 0) {
> +        remainder = buffer.slice(result.bytesUsed, pullIntoDescriptor.bytesFilled);
> +      }
> +
> +      RespondToReadIntoRequest(reader, pullIntoDescriptor.buffer, pullIntoDescriptor.bytesFilled);

Can we move this before `let remainder`? If so we can make that code simpler.

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