docs: def slaveof(self, host=None, port=None):
          """
          Set the server to be a replicated slave of the instance identified
          by the ``host`` and ``port``. If called without arguments, the
          instance is promoted to a master instead.
          """
          if host is None and port is None:
              return self.execute_command('SLAVEOF', Token.get_token('NO'),
                                          Token.get_token('ONE'))
          return self.execute_command('SLAVEOF', host, port)