docs: public int incrementCount(E key, int count) {
      if (tempMInteger == null) {
        tempMInteger = new MutableInteger();
      }
  
      MutableInteger oldMInteger = map.put(key, tempMInteger);
      totalCount += count;
      if (oldMInteger != null) {
        count += oldMInteger.intValue();
      }
      tempMInteger.set(count);
      tempMInteger = oldMInteger;
  
      return count;
    }