Specify that g_menu_item_set_attribute_value consumes floating
@values.
* ASCII characters, digits and '-'.
*
* If @value is non-%NULL then it is used as the new value for the
- * attribute. If @value is %NULL then the attribute is unset.
+ * attribute. If @value is %NULL then the attribute is unset. If
+ * the @value #GVariant is floating, it is consumed.
*
* See also g_menu_item_set_attribute() for a more convenient way to do
* the same.