private IterableChecker<List<String>, String> ids(BooleanHolderCriteria criteria) {
    return CriteriaChecker.<TypeHolder.BooleanHolder>ofReader(repository.find(criteria)).toList(TypeHolder.BooleanHolder::id);
  }
Check for empty results on empty backend
criteria/common/test/org/immutables/criteria/typemodel/BooleanTemplate.java