TODO: add example of class with private constructor and custom serializer/deserializer

object JIntAsString : JStringRepresentable<Int>() {
    override val cons: (String) -> Int = {s: String -> s.toIntOrNull() ?: 0}
    override val render: (Int) -> String = Int::toString
}

object JResponse : JAny<Response>() {
  private val total by JFieldMaybe(Response::total, JIntAsString)

 override fun JsonNodeObject.deserializeOrThrow(): Response = Response(total = +total)
}