** (VECTOR NIL) is a subtype of STRING.
changes in sbcl-0.8.3 relative to sbcl-0.8.2:
+ * SBCL now builds and runs on MacOS X (version 10.2), or perhaps
+ more accurately, on the Darwin kernel running on PowerPC hardware.
+ (thanks to Brian Mastenbrook, Pierre Mai and Patrik Nordebo)
* bug fix: WITH-OUTPUT-TO-STRING (and MAKE-STRING-OUTPUT-STREAM) now
accept and act upon their :ELEMENT-TYPE keyword argument.
(reported by Edi Weitz)