Hi Andrew, Interesting point. > On 23 Sep 2015, at 09:49, Andrew Parsloe <[log in to unmask]> wrote: > > \int_eval:n { - (1+2) } > > gives a "Missing number, treated as zero" message. So does \int_eval:n { + (1+2) }. But > > \int_eval:n { 0 - (1+2) } From memory \numexpr chains +ve and -ve signs appropriately... I'm not sure if it's a good idea but I wonder if prepending "0+" to every <int expr> would work to make this interface a bit more general without adding too much overhead. Will (Sent from phone; please excuse brevity.)