docs: public E argmax(Comparator<E> tieBreaker) {
      int max = Integer.MIN_VALUE;
      E argmax = null;
      for (E key : keySet()) {
        int count = getIntCount(key);
        if (argmax == null || count > max || (count == max && tieBreaker.compare(key, argmax) < 0)) {
          max = count;
          argmax = key;
        }
      }
      return argmax;
    }