I've updated the original post with this information as well... I'll update the wiki momentarily.
Due to a plugin that was already receiving by reference Stefan discovered you can use the receive by reference method (shown above in the case of the 2nd section) for either of the plugin type changes. It was not intended functionality, but does make authoring plugins much simpler.
Due to a plugin that was already receiving by reference Stefan discovered you can use the receive by reference method (shown above in the case of the 2nd section) for either of the plugin type changes. It was not intended functionality, but does make authoring plugins much simpler.