docs: private void resizeMap() {
      int[] newUnsortedKeys = Arrays.copyOf(unsortedKeys, unsortedKeys.length * 2);
      int[] newUnsortedValues = Arrays.copyOf(unsortedValues, unsortedValues.length * 2);
  
      unsortedKeys = newUnsortedKeys;
      unsortedValues = newUnsortedValues;
    }