good thing to have in an FFI system is ability from one language to call another from callback, and back and forth (if it need to). I believe Dart allows for th

good thing to have in an FFI system is ability from one language to call another from callback, and back and forth (if it need to). I believe Dart allows for that. That to be said, stack walking is going to be painful to decode (probably), best I've seen is C#/C++ on Windows - where it flows naturally from one to another.