+ :WRITE-PROTECTED
+ Indicates that the page on which the object starts is write-protected,
+ which indicates for :BOXED objects that it hasn't been written to since
+ the last GC of its generation. (GENCGC and :SPACE :DYNAMIC only.)
+
+ :PAGE
+ The index of the page the object resides on. (GENGC and :SPACE :DYNAMIC
+ only.)
+