Until Java fixes its type system to add nullable types (and not in that ridiculous tri-state nullability method that one JEP proposes), Kotlin will be several steps ahead of Java.
I can speak from experience that Fable 5.1 still writes code that compiles and usually runs fine but throws null pointer exceptions in reasonable edge cases.
I can speak from experience that Fable 5.1 still writes code that compiles and usually runs fine but throws null pointer exceptions in reasonable edge cases.