docs: public MoneyAmountStyle withDecimalPointCharacter(Character decimalPointCharacter) {
          int dpVal = (decimalPointCharacter == null ? -1 : decimalPointCharacter);
          if (dpVal == this.decimalPointCharacter) {
              return this;
          }
          return new MoneyAmountStyle(
                  zeroCharacter,
                  positiveCharacter, negativeCharacter,
                  dpVal, groupingStyle,
                  groupingCharacter, groupingSize, extendedGroupingSize, forceDecimalPoint, absValue);
      }