code: public DecimalStyle withPositiveSign(char positiveSign) {
          if (positiveSign == this.positiveSign) {
              return this;
          }
          return new DecimalStyle(zeroDigit, positiveSign, negativeSign, decimalSeparator);
      }
docs: Returns a copy of the info with a new character that represents the positive sign.
  <p>
  The character used to represent a positive number may vary by culture.
  This method specifies the character to use.
  
  @param positiveSign  the character for the positive sign
  @return  a copy with a new character that represents the positive sign, not null