private static final class SerializedForm<K, V> extends ImmutableMap.SerializedForm<K, V> {
    SerializedForm(ImmutableBiMap<K, V> bimap) {
      super(bimap);
    }

    @Override
    Builder<K, V> makeBuilder(int size) {
      return new Builder<>(size);
    }

    @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;
  }

  @Override
  @J2ktIncompatible // serialization

  private static final class SerializedForm<K, V> extends ImmutableMap.SerializedForm<K, V> {
    SerializedForm(ImmutableBiMap<K, V> bimap) {
      super(bimap);
    }

    @Override
    Builder<K, V> makeBuilder(int size) {
      return new Builder<>(size);
    }

    @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;
  }

  @Override
  @J2ktIncompatible // serialization