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