code: protected String nominalValue(final FieldValue<?> fieldValue) {
          Preconditions.checkNotNull(fieldValue, "FieldValue must not be null");
          if (fieldValue instanceof IntegerFieldValue) {
              return StringUtils.EMPTY + ((IntegerFieldValue) fieldValue).getValue();
          }
          return fieldValue.toString();
      }
docs: Given an int, will return a nominal value. Example:
  1 in weeks context, may mean "Monday",
  so nominal value for 1 would be "Monday"
  Default will return int as String
  
  @param fieldValue - some FieldValue
  @return String