Any way to watch a variable?

' with boxing
interface IPublisher
    method Publish:void(event:string, data:Object)
    method Subscribe:void(subscriber:ISubscriber, event:string)
    method Unsubscribe:void(subscriber:ISubscriber, event:string)
end

' with generics
interface IPublisher<T>
    method Publish:void(event:string, data:T)
    method Subscribe:void(subscriber:ISubscriber, event:string)
    method Unsubscribe:void(subscriber:ISubscriber, event:string)
end

interface ISubscriber
    method OnEventPublished:void(event:string, data:Object)
end

Class Player extends Publisher ' <-- make a base Publisher class to extend which does the bookkeeping for you
    method Score:void(amount:int) property
        score = amount
        Publish("score-changed", BoxInt(score)) ' <-- all the subscribers to the "score-changed" event get notified
    end
    private field score:Int = 0
End Class

Function Main()
	New Test()
End

Class Test Extends App implements ISubscriber

        Method New()
             player = New Player
             player.Subscribe(self, "score-changed") ' <-- subscribe to topics, from now on you'll get notified of changes
        end

	Method OnUpdate()
	    if KeyHit(KEY_ESCAPE) then Error ""
	    Player.Score = Player.Score + 1
	    Print "Player.score:" + Player.score
	    Print "score watch:" + scoreWatch
	End Method

        Method OnEventPublished:void(event:string, data:Object)
            ' you react on the event notifications here
            Select event
                Case "score-changed"
                    scoreWatch = UnboxInt(data) ' or you receive data from the publisher,
                    ' scoreWatch = player.Score   ' or you ask for the data yourself
            End
        End

        Field scoreWatch:= 0
        Field player:Player

End Class

[{"name":"viewedHelp", "requirements":[{"statname":"viewedHelp","checktype":">","value":0}]},
 {"name":"level0Complete", "requirements":[{"statname":"level0Complete","checktype":"=","value":1}]},
 {"name":"level0**", "requirements":[{"statname":"level0Time","checktype":"<","value":3600}]},
 {"name":"level0***", "requirements":[{"statname":"level0Time","checktype":"<","value":2500}]}
]