}

    @Override
    public IdentityConverter<T> reverse() {
      return this;
    }

    @Override
    <S> Converter<T, S> doAndThen(Converter<T, S> otherConverter) {
      return checkNotNull(otherConverter, "otherConverter");
    }

    /*
     * We *could* override convertAll() to return its input, but it's a rather pointless
     * optimization and opened up a weird type-safety problem.
     */