* new feature: the system now signals a continuable error if standard
readtable modification is attempted.
* optimization: faster generic arithmetic dispatch on x86 and x86-64.
+ * bug fix: DEFCLASS and ENSURE-CLASS-USING-CLASS are now expected to
+ be thread safe.
* bug fix: lexical type declarations are now correctly reported by
SB-CLTL2. (reported by Larry D'Anna)
* bug fix: STRING-TO-OCTETS did not handle :START properly when