* to forward to this implementation.
   *
   * @since 7.0
   */
  @Override
  protected boolean standardRetainAll(Collection<?> elementsToRetain) {
    return Multisets.retainAllImpl(this, elementsToRetain);
  }

  /**
   * A sensible definition of {@link #setCount(Object, int)} in terms of {@link #count(Object)},