The R7RS standard explicitly states that map must be able to handle multiple returns. So saying “use at your own risk” is kind of like saying, “this is my own S

The R7RS standard explicitly states that map must be able to handle multiple returns. So saying “use at your own risk” is kind of like saying, “this is my own Scheme dialect with the following differences…” Common Lisp is basically a melange of implementation quirks from the 1980s frozen in time. Even though I’ve personally used it more than Scheme, it’s a mess to implement.