@Nullable
    @Override
    public Comparator<OverheadProducer> getComparator() {
      return Comparator.comparing(c -> {
        Long value = myGetter.apply(c);
        return value != null ? value : Long.MAX_VALUE;
      });
    }
@Nullable
    @Override
    public Comparator<OverheadProducer> getComparator()