* {@link #tailMap}. If you override {@link #tailMap}, you may wish to override {@link
   * #containsKey} to forward to this implementation.
   *
   * @since 7.0
   */
  @Override
  protected boolean standardContainsKey(@CheckForNull Object key) {
    try {
      // any CCE or NPE will be caught
      @SuppressWarnings({"unchecked", "nullness"})
      SortedMap<@Nullable Object, V> self = (SortedMap<@Nullable Object, V>) this;

   * {@link #tailMap}. If you override {@link #tailMap}, you may wish to override {@link
   * #containsKey} to forward to this implementation.
   *
   * @since 7.0
   */
  @Override
  protected boolean standardContainsKey(@CheckForNull Object key) {
    try {
      // any CCE or NPE will be caught
      @SuppressWarnings({"unchecked", "nullness"})
      SortedMap<@Nullable Object, V> self = (SortedMap<@Nullable Object, V>) this;

   * iterator} method of {@link #entrySet}. If you override {@link #entrySet}, you may wish to
   * override {@link #containsKey} to forward to this implementation.
   *
   * @since 7.0
   */
  protected boolean standardContainsKey(@CheckForNull Object key) {
    return Maps.containsKeyImpl(this, key);
  }

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

   * iterator} method of {@link #entrySet}. If you override {@link #entrySet}, you may wish to
   * override {@link #containsKey} to forward to this implementation.
   *
   * @since 7.0
   */
  protected boolean standardContainsKey(@CheckForNull Object key) {
    return Maps.containsKeyImpl(this, key);
  }

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