Embodies the notion of a priority at which a postprocessor should be instantiated, and as such, the order in which they will be called to process events.
Helper opUnary to allow for -10.priority, instead of having to do the (more correct) (-10).priority.
Numerical priority value. Lower is higher.
Embodies the notion of a priority at which a postprocessor should be instantiated, and as such, the order in which they will be called to process events.