* optimization: UNION and NUNION are now O(N+M) for large
inputs as long as the :TEST function is one of EQ, EQL, EQUAL, or
EQUALP.
+ * enhancement: CONS can now stack-allocate on x86 and
+ x86-64. (Earlier LIST and LIST* supported stack-allocation, but
+ CONS did not:)
* enhancement: DEFINE-MODIFY-MACRO lambda-list information is
now more readable in environments like Slime which display it.
(thanks to Tobias C. Rittweiler)