In the wikipedia conventions section on EBNF it suggests that you can have bounded repetitions (https://en.wikipedia.org/wiki/Extended_Backus%E2%80%93Naur_Form#Conventions), but the documentation doesn't say anything about it and I poked around the source and couldn't find anything in cfg that suggested it was there. Is the best way to get bounded reps to just merge in those rules from combinators?