There is an old german proverb that fits here, "Es kann nicht sein, was nicht sein darf", mocking lords and judges who purposefully mixed up things that are physically impossible to happen and things that ought not to happen by policy and made their life awfully easy that way.
People already weren't fond of that kind of logic a hundred years ago.
I think HTML5 sets a good example of how to do it instead: A large part of the standard is about defining behaviour for functionality the standard explicitly deprecates and disallows in compliant documents - all just so "legacy" HTML documents don't end up with "undefined behaviour".
People already weren't fond of that kind of logic a hundred years ago.
I think HTML5 sets a good example of how to do it instead: A large part of the standard is about defining behaviour for functionality the standard explicitly deprecates and disallows in compliant documents - all just so "legacy" HTML documents don't end up with "undefined behaviour".