docs: public void setInvalidValues(final Set<String> invalidValues,
                                   final boolean isCaseSensitive,
                                   final String invalidValueErrorMessage) {
          if (isCaseSensitive) {
              this.invalidValues = invalidValues;
          } else {
              this.invalidValues = new HashSet<String>();
              for (String value : invalidValues) {
                  this.invalidValues.add(value.toLowerCase());
              }
          }
          this.isCaseSensitive = isCaseSensitive;
          this.invalidValueErrorMessage = invalidValueErrorMessage;
      }