rb_obj_id        936 array.c            id = rb_obj_id(obj);
rb_obj_id        956 array.c            return rb_ary_includes(inspect_tbl, rb_obj_id(obj));
rb_obj_id        1757 array.c            id = rb_obj_id(ary2);
rb_obj_id        1409 gc.c               args[1] = rb_ary_new3(1, rb_obj_id(obj)); /* make obj into id */