> the return in development speed Solo project or very small team then? When everyone understands all code? Of course it's faster to go type less then. Add 4

> the return in development speed Solo project or very small team then? When everyone understands all code? Of course it's faster to go type less then. Add 4 more people and you'll end up debugging runtime errors because it was intuitive what you should send to $COLLEAGUE's functions but in reality they expect something else. Or at best, $COLLEAGUE will document the type info in comments :)