code: public static <T> StreamEx<T> ofReversed(List<? extends T> list) {
          int size = list.size();
          return IntStreamEx.ofIndices(list).mapToObj(idx -> list.get(size - idx - 1));
      }
docs: Returns a sequential {@code StreamEx} which elements are elements of
  given list in descending order.
  
  <p>
  The list elements are accessed using {@link List#get(int)}, so the list
  should provide fast random access. The list is assumed to be unmodifiable
  during the stream operations.
  
  @param <T> the type of stream elements
  @param list list to get the elements from
  @return the new stream