docs: def _push_packet(self, packet):
          """
          Appends a packet to the internal read queue, or notifies
          a waiting listener that a packet just came in.
          """
          self._read_queue.append((decode(packet), packet))
  
          if self._read_waiter is not None:
              w, self._read_waiter = self._read_waiter, None
              w.set_result(None)