Followup to that "NO" reply for inline classes. Is there java interop?

You will java interop for things that use the unboxed inner value at least (like a function taking your inline value class as argument). But I'm not sure for when it is boxed (like when it take a list of your class).

the param argument is good enough. Thanks!

In this case it will be compiled as the unboxed value as far as java is concerned, so you can pass the inner value directly from Java.

thats good. I ran into another issue with the @JvmOverloads annotation which made me worried

Check out the section "Changing JVM name for Java Calls" on how to do Java interop with Inline classes: https://blog.jetbrains.com/kotlin/2021/02/new-language-features-preview-in-kotlin-1-4-30/ and/or the "mangling function names" section of this video on Inline Classes (starting at 7:57)