If there are gonna be "priorities" (in reality its "order") they should be user controllable, someone might like @b4n indentation for C but language specific ones for C++. Anyway thats something we can work on in the future.
Hum, if we want this to be user-controlled outside the plugins (e.g. not have each plugin allow selecting its "priority"), we'll need a way to identify the extensions, like a name. We can add this to `register()` if need be (more artificial parameters for hypothetical cases :smile:), but better add it now that change the API if we know it gotta change.