I guess one could get in trouble if you were writing a compiler, as users could write conforming code that you thought was undefined. I don't see how one could

I guess one could get in trouble if you were writing a compiler, as users could write conforming code that you thought was undefined. I don't see how one could get into trouble as a developer though. It seems to me that, while technically incorrect, the blog imposes more restrictions than is actually neccessary on the user.