docs: async def spawn_n(self, agent_cls, n, *args, addr=None, **kwargs):
          """Same as :meth:`~creamas.mp.MultiEnvironment.spawn`, but allows
          spawning multiple agents with the same initialization parameters
          simultaneously into **one** slave environment.
  
          :param str agent_cls:
              ``qualname`` of the agent class. That is, the name should be in the
              form of ``pkg.mod:cls``, e.g. ``creamas.core.agent:CreativeAgent``.
          :param int n: Number of agents to spawn
          :param str addr:
              Optional. Address for the slave enviroment's manager.
              If :attr:`addr` is None, spawns the agents in the slave environment
              with currently smallest number of agents.
  
          :returns:
              A list of (:class:`aiomas.rpc.Proxy`, address)-tuples for the
              spawned agents.
  
          The ``*args`` and ``**kwargs`` are passed down to each agent's
          :meth:`__init__`.
          """
          if addr is None:
              addr = await self._get_smallest_env()
          r_manager = await self.env.connect(addr)
          return await r_manager.spawn_n(agent_cls, n, *args, **kwargs)