Fortunately this is also the simplest to implement, since this is the default. So just don't go out of your way to write code to restrict these to some arbitrar

Fortunately this is also the simplest to implement, since this is the default. So just don't go out of your way to write code to restrict these to some arbitrary subset of characters and tell me I have an "illegal name". You probably need a length limit to prevent against attacks though. Just don't set it at 31 character.