public static function unnest()
    {
        // Unnest unless we would be left at 0 manifests
        $loader = ConfigLoader::inst();
        if ($loader->countManifests() <= 1) {
            user_error(
                "Unable to unnest root Config, please make sure you don't have mis-matched nest/unnest",
                E_USER_WARNING
            );
        } else {
            $loader->popManifest();
        }
        return static::inst();
    }