@Override
    @CheckForNull
    public K put(@ParametricNullness V value, @ParametricNullness K key) {
      return putInverse(value, key, false);
    }

    @Override
    @CheckForNull
    public K forcePut(@ParametricNullness V value, @ParametricNullness K key) {
      return putInverse(value, key, true);
    }

    @Override
    @CheckForNull
    public K remove(@CheckForNull Object value) {

    @CheckForNull
    public K put(@ParametricNullness V value, @ParametricNullness K key) {
      return forward.putInverse(value, key, false);
    }

    @Override
    @CanIgnoreReturnValue
    @CheckForNull
    public K forcePut(@ParametricNullness V value, @ParametricNullness K key) {
      return forward.putInverse(value, key, true);
    }

    @Override
    public BiMap<K, V> inverse() {
      return forward;