Well, part of my point was that new primitives (vector-map!) are being introduced that makes this more convenient (and already exist in most Schemes). To your p

Well, part of my point was that new primitives (vector-map!) are being introduced that makes this more convenient (and already exist in most Schemes). To your point, there are numerous loop macro sets that make the do in my vector-map! simpler, but I didn't want to introduce any external dependancies (or implementation dependancies), and I thought it was clear enough.