@flawr Hm, good point. Also, normalizing to [0,1] (by an affine transformation) seems to be a useful operation that I've sometimes considered adding

& has already been used up for Xl, so it have to be four characters: 1$Xl

Actually only one char would be saved compared to 1O&Xl

or maybe a default for [-1,1] or [-pi,pi] would make more sense

or for [-x,x]