return plugin;
            }
        });
    }

    static <T> List<T> map(List<T> list, Function<T, T> mapper) {
        List<T> newList = list;
        for (int i = 0; i < newList.size(); i++) {
            T oldT = newList.get(i);
            T newT = mapper.apply(oldT);
            if (newT != oldT) {
                if (newList == list) {
                    newList = new ArrayList<>(list);