docs: public MonetaryFormat code(int codeShift, String code) {
          checkArgument(codeShift >= 0);
          final String[] codes = null == this.codes
              ? new String[MAX_DECIMALS]
              : Arrays.copyOf(this.codes, this.codes.length);
  
          codes[codeShift] = code;
          return new MonetaryFormat(negativeSign, positiveSign, zeroDigit, decimalMark, minDecimals, decimalGroups,
                  shift, roundingMode, codes, codeSeparator, codePrefixed);
      }