return copyOfInternal((Ordering<E>) Ordering.natural(), (Collection<E>) elements, false);
  }

  // Unsafe, see ImmutableSortedSetFauxverideShim.
  @SuppressWarnings("unchecked")
  public static <E> ImmutableSortedSet<E> copyOf(Iterable<? extends E> elements) {
    return copyOfInternal((Ordering<E>) Ordering.natural(), (Iterable<E>) elements, false);
  }

  public static <K, V> ImmutableSortedMap<K, V> copyOf(Map<? extends K, ? extends V> map) {
    return copyOfInternal((Map<K, V>) map, (Ordering<K>) Ordering.natural());
  }

  public static <K, V> ImmutableSortedMap<K, V> copyOf(
      Map<? extends K, ? extends V> map, Comparator<? super K> comparator) {
    return copyOfInternal(map, checkNotNull(comparator));
  }

  // Unsafe, see ImmutableSortedMapFauxverideShim.