"make-vector" is creating a new vector populated with *references* to a
single #("1" "2" "3") vector, *not* *copies* of the #("1" "2" "3") vector.
Since you've created one #("1" "2" "3") vector, changing it through one
reference changes all references to it.
(Aside to PLT people: This might be an example of having the default
writer show sharing could actually be helpful to beginners.)
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