1 check with loadWithNewGlobal
   2 obj.x 344
   3 obj.y 12
   4 obj instanceof global.Point? true
   5 p.x 343
   6 p.y 54
   7 p instanceof P? true
   8 check with script engine
   9 obj.x 344
  10 obj.y 12
  11 obj instanceof global.Point? true
  12 p.x 343
  13 p.y 54
  14 p instanceof P? true