+ * enhancement: reduced conservativism on GENCGC platforms:
+ conservative roots must be valid-looking tagged pointers or point
+ within a code object, not merely point to within the allocated part
+ of a page, in order to pin a page.
+ * enhancement: support for "Mac Roman" external format.
+ * enhancement: encapsulation of named generic functions now happens without
+ altering the identity of the function bound to the name.