Just as it's possible to model immutability on top of mutable structures, it's possible to model mutability on top of immutable structures. Regardless of which

Just as it's possible to model immutability on top of mutable structures, it's possible to model mutability on top of immutable structures. Regardless of which way you go, you end up with the properties associated with the kind of structure you're building. This is not too surprising, I would think.