> Kotlin is very reference semantics, itʼs a thin layer on top of Java
One of the main points of Kotlin is that it integrates tightly with IntelliJ. So Kotlin is a layer (not so thin) between a visual IDE (IntelliJ or Android Studio) and Java-decompilable bytecodes on the JVM.
You don't get that with other JVM languages, e.g. Apache Groovy only gives correct type hints in Eclipse 80% of the time, and JAD stopped working on Groovy-generated bytecodes in Groovy 1.7.
One of the main points of Kotlin is that it integrates tightly with IntelliJ. So Kotlin is a layer (not so thin) between a visual IDE (IntelliJ or Android Studio) and Java-decompilable bytecodes on the JVM.
You don't get that with other JVM languages, e.g. Apache Groovy only gives correct type hints in Eclipse 80% of the time, and JAD stopped working on Groovy-generated bytecodes in Groovy 1.7.