do (funcall fn object value))
object)))
+(defun filter-initargs-by-class (class initargs)
+ (iter (with slots = (class-slots class))
+ (for (arg-name arg-value) on initargs by #'cddr)
+ (for slot = (find arg-name slots :key #'slot-definition-initargs :test 'member))
+ (when (or (eq arg-name :pointer) (null slot))
+ (nconcing (list arg-name arg-value)))))
+
+(defmethod initialize-instance ((instance g-object) &rest initargs &key &allow-other-keys)
+ (let ((filtered-initargs (filter-initargs-by-class (class-of instance) initargs)))
+ (apply #'call-next-method instance filtered-initargs)))
+
(defmethod make-instance ((class gobject-class) &rest initargs &key pointer)
(if pointer
(progn