anchor.diff:                OnUnregister = Scripting.Unit
                 OnUpdate = Scripting.Unit
                 OnPostUpdate = Scripting.Unit
  -              OnSignal = Scripting.Unit
  -              Depth = 0.0f
  -              Visible = true
  -              Persistent = true }
  +              OnSignal = Scripting.Unit }
   
           /// Try to get an xtension property and its type information.
           static member tryGetProperty propertyName layerState =
  
positive.code:           CreationTimeStamp : int64
            Xtension : Xtension
            Dispatcher : ScreenDispatcher
            ScriptOpt : Symbol AssetTag option
            Script : Scripting.Expr array
            ScriptFrame : Scripting.DeclarationFrame
  
negative.code:           CreationTimeStamp : int64
            Xtension : Xtension
            Dispatcher : LayerDispatcher
            Depth : single
            Visible : bool
            Persistent : bool
            ScriptOpt : Symbol AssetTag option
            Script : Scripting.Expr array
            ScriptFrame : Scripting.DeclarationFrame
  