It is "removing" undefined behavior by simply defining it to be something no one would ever ever want ;P. If you are willing to just define behavior arbitrarily then I think you will find the vast majority of (but admittedly not all) undefined behaviors can be made "safe".
Nobody wants undefined behaviour. That's always worse than defining it, whatever that definition is. In any case, there are better options for selecting the behaviour you want instead of using `as`.
