public static function paths($path = null) {
		if (empty($path)) {
			return static::$_paths;
		}
		if (is_string($path)) {
			return isset(static::$_paths[$path]) ? static::$_paths[$path] : null;
		}
		static::$_paths = array_filter(array_merge(static::$_paths, (array) $path));
	}