def _set_persistent(self, **kwargs):
        """Set values in this config and in the environment so they persist into subprocess.

        Args:
            **kwargs: The kwargs passed to the config.
        """
        for key, value in kwargs.items():
            if value is not None:
                os.environ[self._prefixes[0] + key.upper()] = str(value)
            setattr(self, key, value)
        self._non_default_attributes.update(kwargs)
        self._replace_defaults(**kwargs)
Set values in this config and in the environment so they persist into subprocess.

        Args:
            **kwargs: The kwargs passed to the config.
        
reflex/config.py