Well, backwards compability is kind of a binary thing, isn't it. Either you're aiming for backwards compability and you can be sure your legacy code will keep r

Well, backwards compability is kind of a binary thing, isn't it. Either you're aiming for backwards compability and you can be sure your legacy code will keep running, or you don't. In fact it would be more helpful to throw fatal errors because a method signature changed, than start returning different and unexpected values which can break data integrity in subtle ways.