proper tail recusion for `or'

[Marco Maggesi <maggesi@math.unifi.it>]

Please, correct me if I am wrong.  By using the stepper, it seems that
DrScheme do not handle tail recursion properly for `or'.  Is this a bug?

Here is an example:

  (define (list-or l)
    (if (null? l)
        #t
        (or (car l) (list-or (cdr l)))))
  
  (list-or (list #f #f #f #f #f #f #t))

Thank you.
MM