public Converter<B, A> reverse() {
    Converter<B, A> result = reverse;
    return (result == null) ? reverse = new ReverseConverter<>(this) : result;
  }

  private static final class ReverseConverter<A, B> extends Converter<B, A>
      implements Serializable {
    final Converter<A, B> original;

    ReverseConverter(Converter<A, B> original) {
      this.original = original;
    }

    /*