docs: private static Comparable normaliseStringType(final Comparable operand) {
          if (operand instanceof Character) {
              return (int) (Character) operand;
          }
          if (operand instanceof String) {
              final String string = (String) operand;
  
              if (string.length() == 1) {
                  return (int) string.charAt(0);
              }
              return string;
          }
          return operand;
      }