User blog comment:Hyp cos/R function II/@comment-2033667-20150408132907/@comment-2033667-20150408134658

Why allow positive integers in the syntax when {0} will do? Why not consider the use of positive integers an abbreviation, and just have 0 in the syntax?

On that note, I tried applying the rules to nR01 (where the 0 and 1 are separate numeric terms) and got an undefined result. We first scan the 0 term, and cases A1-A3 don't apply, so A4 comes into action and we move onto the 1. However the 1 is not preceded by an R, a brace, nor a separator, so none of the cases apply.