Yeah, they just lack exposure to systems that do:
:; sbcl
This is SBCL 1.5.5, an implementation of ANSI Common Lisp.
...
* (/ 1 3)
1/3 :; sbcl
This is SBCL 1.5.5, an implementation of ANSI Common Lisp.
...
* (/ 1 3)
1/3