docs: def _get_new_msg_id(self):
          """
          Generates a new unique message ID based on the current
          time (in ms) since epoch, applying a known time offset.
          """
          now = time.time() + self.time_offset
          nanoseconds = int((now - int(now)) * 1e+9)
          new_msg_id = (int(now) << 32) | (nanoseconds << 2)
  
          if self._last_msg_id >= new_msg_id:
              new_msg_id = self._last_msg_id + 4
  
          self._last_msg_id = new_msg_id
          return new_msg_id