@Override
                public boolean tryAdvance(Consumer<? super R> action) {
                  if (fromIterator.hasNext()) {
                    action.accept(function.apply(fromIterator.nextDouble(), index++));
                    return true;
                  }
                  return false;
                }
              },
              isParallel)
          .onClose(stream::close);
    }

                @Override
                public boolean tryAdvance(Consumer<? super R> action) {
                  if (fromIterator.hasNext()) {
                    action.accept(function.apply(fromIterator.nextDouble(), index++));
                    return true;
                  }
                  return false;
                }
              },
              isParallel)
          .onClose(stream::close);
    }