Comment by dominicrose

From the official website: > Dart enforces a sound type system. This means you can't write code where a variable's value differs from its static type.

I know you didn't ask me but I think that not ensuring soudness is a feature because it allows the type system to wrap something that could work without it. Would you like unit tests if removing them would break your code? Maybe it's not a fair comparison, or maybe it is...