MyData := new FinalBox("Immutable data")
MsgBox % "MyData.Data = " MyData.Data
MyData.Data := "This will fail to set"
MsgBox % "MyData.Data = " MyData.Data

Class FinalBox {
   __New(FinalValue) {
      ObjInsert(this, "proxy",{Data:FinalValue})
   }
; override the built-in methods:
   __Get(k) {
      return, this["proxy",k]
   }
   __Set(p*) {
      return
   }
   Insert(p*) {
      return
   }
   Remove(p*) {
      return
   }
}