[plt-scheme] should `map' reuse cons cells?

On May 26, Doug Orleans wrote:
> Anyway, I think it would be nice for PLT's implementation of `map' to
> reuse longest common tails.  (Or at least PLT's implementation of
> SRFI-1's version of `map'.)  Thoughts?

Wouldn't it be healthier to simply add a `map!'?
-- 
          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                  http://www.barzilay.org/                 Maze is Life!