Good news: KVision will probably still work with Kotlin 1.4 😉 I've managed to compile the almost all of the framework and the helloworld app with new IR compiler backend.
Another good news: The final bundle size was reduced by 30% - although I was hoping for more after reading [Kotlin blog post](
https://blog.jetbrains.com/kotlin/2020/03/kotlin-1-4-m1-released/).
Bad news: It's still buggy. I've got stack overflow error from the compiler when I've tried to compile the showcase example. Some external libraries do not work (kotlinx-html-js, react, redux, kotlin-redux). There will be problems with npm dependencies, because there are no more jar artifacts I can put generated package.json files. But I hope it will all get better ;-)