}
  }

  /** A sink that writes outgoing data frames of a stream. This class is not thread safe. */
  internal inner class FramingSink(
    /** True if either side has cleanly shut down this stream. We shall send no more bytes. */
    var finished: Boolean = false,
  ) : Sink {
    /**
     * Buffer of outgoing data. This batches writes of small writes into this sink as larges frames