My guesses would be handling unsigned hex https://youtrack.jetbrains.com/issue/KT-4749 https://youtrack.jetbrains.com/issue/KT-4749 And bitwise operations http

My guesses would be handling unsigned hex https://youtrack.jetbrains.com/issue/KT-4749 https://youtrack.jetbrains.com/issue/KT-4749 And bitwise operations https://discuss.kotlinlang.org/t/when-does-bit-fiddling-come-to-kotlin/2249 https://discuss.kotlinlang.org/t/when-does-bit-fiddling-come... And maybe handling generics. I haven't had any issues, but kotlin is a bit stricter which is generally a good thing, but I'd believe that for some edge case it makes things harder.