Note that mapover is less general than map. It's explicitly designed for the "long anonymous function" case, so you cannot do
(mapover '(1 2 3) '(4 5 6) +)
; instead, you must do
(mapover '(1 2 3) '(4 5 6) (x y)
(+ x y))
. This is why it is a macro: it needs to treat its last two arguments as part of a function body, so it cannot evaluate them. As a macro, it can package them up and put them in a function, which can be passed to map along with the lists.
nap is a clever function, but will oddly allow you to write (map '(1 2 3) < > '(4 5 6)), which is meaningless. Nevertheless, It's not a terrible idea.
