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is there any proper way to create abstract factory functions to force their implementation? I have an abstract class `Packet` (for networking) that needs a `serialize` and `deserialize` function. the former is easy, just a regular abstract function with a `ByteWriteChannel` param to write the packet into. the latter however needs to be either a top-level extension function for `ByteReadChannel` or in the companion object, neither of which allows the `abstract` keyword (obviously). how do I ensure that each `Packet` class implements a `deserialize` factory function ?

how would this even be used? since you do not have the instance of the packet yet .. how would it know of what type it is and which `deserialize`  to call?

i would opt for a exhaustive `when` with some enum or making Packets a sealed class
that way i should not overlook or miss any

if you use kotlinx-serialization then polymoprhic serializers for sealed classes are also a cool option, but it might need some manual tweaking to get this working for a `ByteReadChannel` , assuming your packets are not in a serialization supported format