circumstances we should decrement the refcount of the parent when freeing
the child.
-There is a further complication with non-closure anonymous subs (ie those
+There is a further complication with non-closure anonymous subs (i.e. those
that do not refer to any lexicals outside that sub). In this case, the
anonymous prototype is shared rather than being cloned. This has the
consequence that the parent may be freed while there are still active