[ptx]

"Unknown"? They have said from the beginning that it uses reference counting with cycle collection, for example in RELEASE_NOTES.md:

"Currently Kotlin/Native uses reference counting based memory management scheme with a cycle collection algorithm. Multiple threads could be used, but no objects shared between threads are allowed."

They have also said that it's pluggable and they might experiment with other collectors on different platforms, but it's hardly "unknown".

The size of generated JS is definitely a problem at the moment but they're working on it:

https://discuss.kotlinlang.org/t/kotlin-js-file-size/2501/2

[virtualwhys]

The point is that the claim of cross platform everything is wildly unrealistic at this time. JVM/Android is production ready; javascript, getting there; native, not even close.

I don't doubt that 2-3 years from now Kotlin will have a cross platform solution, but to claim so today is borderline delusional. It's understandable that users are excited, Kotlin's on the verge of bigger things, perhaps even mainstream level adoption if everything falls into place, but there's a ways to go before they achieve one-language-to-rule-them-all.