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04b4307b3d
This one is a bit unusual, so to clarify: Previously, callers of get_iterator_values() would supply a callback that would return an IterationDecision, and an enum to indicate whether iterator_close() should be invoked upon IterationDecision::Break. Now, use of both those enums is removed, and callers must return an Optional<Completion>. If a Completion is provided, the iterator will be closed, and that completion will be returned from get_iterator_values. Otherwise, once the iterator is exhausted, a default-initialized Completion will be returned.