Similar problems exists for copy/deepCopy:

(33) -> x:=[[1,2],[3,4]]

   (33)  [[1,2],[3,4]]
                                            Type: 
List(List(PositiveInteger))
(34) -> y:=queue x

   (34)  [[1,2],[3,4]]
                                           Type: 
Queue(List(PositiveInteger))
(35) -> x.1.1 := 5

   (35)  5
                                                        Type: 
PositiveInteger
(36) -> y

   (36)  [[5,2],[3,4]]
                                           Type: 
Queue(List(PositiveInteger))


Should we use deepCopy and guarantee that construct doesn't
share any part of its argument?

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