zend_list_addref and object resources

Hi, I'm having a bit of a conundrum that maybe someone here can help me out with :-). When assigning an object resource to either 'getThis()' or 'return_value' as shown below, is it necessary to manually increment the reference count? For example, /ext/ming/ming.c (version 1.70) contains many code fragments like the following where zend_list_addref() is used with 'getThis()', and not used with 'return_value': <snip ming.c:297> ret = zend_list_insert(action, le_swfactionp); object_init_ex(getThis(), action_class_entry_ptr); add_property_resource(getThis(), "action", ret); zend_list_addref(ret); </snip> <snip ming.c:1979> ret = zend_list_insert(item, le_swfdisplayitemp); object_init_ex(return_value, displayitem_class_entry_ptr); add_property_resource(return_value, "displayitem", ret); </snip> Looking at earlier revisions of this file, it appears that usage of zend_list_addref() with 'return_value' has been steadily decreasing. There is, however, one place where zend_list_addref() with 'return_value' is still being called: <snip ming.c:1686> int ret = zend_list_insert(shape, le_swfshapep); object_init_ex(return_value, shape_class_entry_ptr); add_property_resource(return_value, "shape", ret); zend_list_addref(ret); </snip> I can't find enough examples in other modules to feel confident that zend_list_addref() with 'return_value' is a bad thing (some use it, some don't), and my testing seems to show that everything works fine with or without the explicit zend_list_addref() call for both 'return_value' and 'getThis()'. That said, is there a "correct" way to handle reference counting with 'getThis()' and 'return_value' in this situation? Thanks, Marshall