*     is to be used to sort the new map
   * @return a new {@code TreeMap} initialized with the mappings from {@code map} and using the
   *     comparator of {@code map}
   */
  public static <K extends @Nullable Object, V extends @Nullable Object> TreeMap<K, V> newTreeMap(
      SortedMap<K, ? extends V> map) {
    return new TreeMap<>(map);
  }

  /**