;; SIGNED-BYTE arrays, so better make it break now if it ever
;; will:
#+sb-xc-host
+ ;; not SB!XC:UPGRADED-ARRAY-ELEMENT-TYPE, because we are
+ ;; worried about whether the host's implementation of arrays.
(aver (subtypep (upgraded-array-element-type specializer)
'unsigned-byte))
(coerce seq `(simple-array ,specializer (*)))))))