<C> Converter<A, C> doAndThen(Converter<B, C> secondConverter) {
    return new ConverterComposition<>(this, checkNotNull(secondConverter));
  }

  private static final class ConverterComposition<A, B, C> extends Converter<A, C>
      implements Serializable {
    final Converter<A, B> first;
    final Converter<B, C> second;

    ConverterComposition(Converter<A, B> first, Converter<B, C> second) {
      this.first = first;

  <C> Converter<A, C> doAndThen(Converter<B, C> secondConverter) {
    return new ConverterComposition<>(this, checkNotNull(secondConverter));
  }

  private static final class ConverterComposition<A, B, C> extends Converter<A, C>
      implements Serializable {
    final Converter<A, B> first;
    final Converter<B, C> second;

    ConverterComposition(Converter<A, B> first, Converter<B, C> second) {
      this.first = first;