def check_config_types(self):
        """Assert that config values are of the same type as default values."""
        self._known_types(cherrypy.config)
        for sn, app in cherrypy.tree.apps.items():
            if not isinstance(app, cherrypy.Application):
                continue
            self._known_types(app.config)
Assert that config values are of the same type as default values.
cherrypy/_cpchecker.py