docs: public MonetaryFormat positiveSign(char positiveSign) {
          checkArgument(!Character.isDigit(positiveSign));
          if (positiveSign == this.positiveSign)
              return this;
          else
              return new MonetaryFormat(negativeSign, positiveSign, zeroDigit, decimalMark, minDecimals, decimalGroups,
                      shift, roundingMode, codes, codeSeparator, codePrefixed);
      }