Partial instantiation is cool and all, but tbh I prefer just capturing the initial incomplete attributes in one complete record, pass that around, and then inst

Partial instantiation is cool and all, but tbh I prefer just capturing the initial incomplete attributes in one complete record, pass that around, and then instantiate the real thing when you have all attributes data class IncompletePerson(val name: String) data class Person( val name: String, val email: String ) or data class Person( val initialAttributes: IncompletePerson, val email: String ) if you want to nest it. if you're the type to instead do this data class Person( val name: String, val email: String? ) I never want to work with your code. Now, there's no disambiguation between the complete object and the incomplete one, I always have to check before doing anything with it, and people will inevitably try send an incomplete object someplace that can't handle it and generate bugs.