What are inline classes


On the Kotlin github repository I’ve seen commits (1, 2, 3) referencing inline classes. I could not find any informations about them so I assume they are an experimental/WIP feature. I’m curious though what are they and is there any ETA on them. Are they going to do something like kotlinx.atomicfu does?

"Shadow" classes - typealias+extensions with teeth?
Explicit cast for type aliases

See here
section 9