;; the number of extra elements we use at the end of the array for
;; low level hackery (e.g., one element for arrays of BASE-CHAR,
;; which is used for a fixed #\NULL so that when we call out to C
;; we don't need to cons a new copy)
;; the number of extra elements we use at the end of the array for
;; low level hackery (e.g., one element for arrays of BASE-CHAR,
;; which is used for a fixed #\NULL so that when we call out to C
;; we don't need to cons a new copy)