Since `expect class` cannot have default members, ...

# multiplatform

[agrosner]

Since expect class cannot have default members, I have to make a separate common class abstract and then the expect extend the abstract class. use case: I want android/jvm-specific methods on the jvm side vs kotlin native/js side. Is this intended? Something like C# partial class would relieve the need for shared abstract class that I must expose outside my internal library