* you override {@link #entrySet}, you may wish to override {@link #size} to forward to this
   * implementation.
   *
   * @since 7.0
   */
  protected int standardSize() {
    return Multisets.linearTimeSizeImpl(this);
  }

  /**
   * A sensible, albeit inefficient, definition of {@link #equals} in terms of {@code
   * entrySet().size()} and {@link #count}. If you override either of these methods, you may wish to