- ;; pointer or immediate data. Disregarding the possibility of an
- ;; unbound-marker (permitted, according to the GC), this means
- ;; either a fixnum, a character, a single-float on a 64-bit system,
- ;; or a pointer.
+ ;; pointer or immediate data. According to the runtime this means
+ ;; either a fixnum, a character, an unbound-marker, a single-float
+ ;; on a 64-bit system, or a pointer.