Readonlyexcludedthe method definitions the call cannot run
Readonlynextper method, the methods a NextMethod()/callNextMethod() within it may run; a method missing here may run any
Optional Readonlyreadsthe registrations the choice relies on beyond those of the methods, which the call depends on
What the dispatch of one call rules out, and what the next-method calls of the methods it runs may run.