    def pre_materialize(self, *args, **kwargs):
        """Turn arguments to their values before passed
        to child processes/threads.
        """
        self._params = {
            key:
                value
                if not isinstance(value, BaseArgument)
                else value.stage(*args, **kwargs)
            for key, value in self._params.items()
        }
        return self
Turn arguments to their values before passed
to child processes/threads.
rocketry/core/parameters/parameters.py