[klysm]

I agree with this. The biggest thing that’s missing for me is sealed sum types. We’re getting there but progress is slow.

[therealdrag0]

Does Scala have that?

[erik_seaberg]

Scala has sealed traits, which may only be implemented in the same file, and pattern matching must be exhaustive. At a glance, Java 17 has something similar (JEP 409 sealed classes).