Reports that say that something isn't defined are always interesting to me, because as we define, there are defined undefines; there are things we define we define. We also define there are defined undefines; that is to say we define that there are some things we do not define. But there are also undefined undefines – the ones we don't define we don't define. And if one looks throughout the history of our language and other free languages, it is the latter category that tend to be the non-conformant ones.