Amt returns a set of changes that transform `preArr` into `curArr`.

CompareArray accepts two *adt.Array's and an ArrayDiffer implementation.

CompareMap accepts two *adt.Map's and an MapDiffer implementation.

Hamt returns a set of changes that transform `preMap` into `curMap`.

ArrayDiffer generalizes adt.Array diffing by accepting a Deferred type that can unmarshalled to its corresponding struct in an interface implantation.

MapDiffer generalizes adt.Map diffing by accepting a Deferred type that can unmarshalled to its corresponding struct in an interface implantation.