(equal-values? null null) = #t  OK
(equal-values? (static-cast <object> null) null) = #t  OK
(equal-values? null (static-cast <object> null)) = #t  OK
(equal-values? (static-cast <object> null) (static-cast <object> null)) = #t  OK
(equal-objects? null null) = #t  OK
(equal-objects? (static-cast <object> null) null) = #t  OK
(equal-objects? null (static-cast <object> null)) = #t  OK
(equal-objects? (static-cast <object> null) (static-cast <object> null)) = #t  OK
(equal-contents? null null) = #t  OK
(equal-contents? (static-cast <object> null) null) = #t  OK
(equal-contents? null (static-cast <object> null)) = #t  OK
(equal-contents? (static-cast <object> null) (static-cast <object> null)) = #t  OK
