COPrimitiveCollection.m: factor out a bunch of [obj isKindOfClass: [COPath class]] calls into a COIsTombstone() function.
COPrimitiveCollection.m: factor out a bunch of [obj isKindOfClass: [COPath class]] calls into a COIsTombstone() function.

etoile/CoreObject,etoile/CoreObject,etoile/CoreObject,etoile/CoreObject