* than this method, and this method in turn generally performs better than copying the list and
   * calling {@link Collections#sort(List)}.
   */
  // TODO(kevinb): rerun benchmarks including new options
  @SuppressWarnings("nullness") // TODO: b/316358623 - Remove after checker fix.
  public <E extends T> List<E> sortedCopy(Iterable<E> elements) {