private IterableChecker<List<String>, String> ids(BigDecimalHolderCriteria criteria) {
    return CriteriaChecker.<TypeHolder.BigDecimalHolder>ofReader(repository.find(criteria)).toList(TypeHolder.BigDecimalHolder::id);
  }
Testing various string operations prefix/suffix/length etc.
criteria/common/test/org/immutables/criteria/typemodel/BigDecimalTemplate.java