code: func ReliableRPC(
  	routeStr string,
  	metadata map[string]interface{},
  	reply, arg proto.Message,
  ) (jid string, err error) {
  	return app.worker.EnqueueRPC(routeStr, metadata, reply, arg)
  }
docs: // ReliableRPC enqueues RPC to worker so it's executed asynchronously
  // Default enqueue options are used