IMHO, if you already have the whole list then there's no point in returning an iterator, arrays are easier to handle and allow more operations. OTOH, if you checked near the beginning of the function and then either produced all the items and returned them in a list/array-ref or created an iterator that'll produce the items one at a time then it might be usefull.
Quite often though I believe you'll find the iterator too restricted sooner or later so you might use an object already. Even if for the start there's just a single method GetNext().
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