@evanchooly yes and yes.
Full disclosure, I’m a member of the Apache Groovy team and I would also be bothered if a Java library suddenly added Groovy to provide internal behavior that Java could do. Same would apply to any other JVM language, they are not “just a library”.
@evanchooly writing kotlin I would not notice, writing java I would be upset and look for alternatives.
A java core with optional kotlin sugar is appealing. Kmp has a different but interesting reach. The fact that conciling both requires a port most of the time is kind of irritating