code: func (v *Object) GetPropertyType(name string) (Type, error) {
  	cstr := C.CString(name)
  	defer C.free(unsafe.Pointer(cstr))
  
  	paramSpec := C.g_object_class_find_property(C._g_object_get_class(v.native()), (*C.gchar)(cstr))
  	if paramSpec == nil {
  		return TYPE_INVALID, errors.New("couldn't find Property")
  	}
  	return Type(paramSpec.value_type), nil
  }
docs: // GetPropertyType returns the Type of a property of the underlying GObject.
  // If the property is missing it will return TYPE_INVALID and an error.