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Implement seeking of `packed-ref` iterators. The implementation is again straight forward, except that we cannot continue to use the prefix iterator as we would otherwise not be able to reseek the iterator anymore in case one first asks for an empty and then for a non-empty prefix. Instead, we open-code the logic to in `advance()`. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>