I think prior to 3.8.3 sorted maps, maps were serialized using msg_pack. Storage space difference between bins and maps - i think they are still serialized with msg_pack but added info is added for key/index based sorting. Since msg_pack offers compaction, I would think any change will be a full rewrite regardless of storage being memory or disk. So I would think it is a full rewrite - but perhaps kporter may shed more light on the topic.
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