Basically, the proposed challenge is about a new numeral system I made. Though the proposal doesn't require the I/O format to be in the numeral system, I have a serious problem now: This opens new possibility for an I/O format about integers.
AFAIK, our default policies about I/O formats don't stop from inputting/outputting integers in this new format. We even allow using different formats for the input and the output.
Though I've just prohibited I/O in NDos-numeral as a stopgap, there might appear new programming languages whose default I/O format for integers is NDos-numeral, and I hope that would be considered a standard loophole.
What should I do?