* {@link #entrySet}. If you override {@link #entrySet}, you may wish to override {@link
   * #containsValue} to forward to this implementation.
   *
   * @since 7.0
   */
  protected boolean standardContainsValue(@CheckForNull Object value) {
    return Maps.containsValueImpl(this, value);
  }

  /**
   * A sensible implementation of {@link Map#entrySet} in terms of the following methods: {@link