resume: dispatch iterators via Either#13
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Restore awkwardly worked around its different iterator types through generics (internally) and consuming the iterator (return value). Dispatching on a concrete type saves us from needlessly consuming the iterator and having to use generics.
This PR adds a dependency to the
eithercrate and dispatches on it for restore's iterators. It also prefersBox<[T]>toVec<T>where applicable and movesDashMapto an internal context module type.