1. They are compile time, but runtime features such as attribute delegation could provide the interface (role ordering is the real problem here)
2. They don't ensure anything other than the method name.
I think this problem can be solved better by using
around instead of requires
Ordering of course still matters here as you can have multiple `around` modifiers on a method. This will throw an exception if method is missing or if the types passed in are not correct.
