Joseph Wright a écrit : > \xparse_process_comma_split:n { 1,2 } => {1} {2} > > but what should happen with > > \xparse_process_comma_split:n { 12 } > > A the moment you get "{12} \NoValue" so that exactly two results are > returned. Should you get perhaps just \NoValue, or something else? IMO {12} \NoValue is the best solution: it conveys all the initial information, is a form that is easy to use. Manuel.