code: def _build_stack(self):
          
          return self._stack_from_spec(
              ansible_mitogen.transport_config.PlayContextSpec(
                  connection=self,
                  play_context=self._play_context,
                  transport=self.transport,
                  inventory_name=self.inventory_hostname,
              )
          )
docs: Construct a list of dictionaries representing the connection
          configuration between the controller and the target. This is
          additionally used by the integration tests "mitogen_get_stack" action
          to fetch the would-be connection configuration.