- Create zone with bad key (min > max)
- Create zone with single value (min == max)
- Zone with collection that has "no balance" setting for the collection
- Zone change from A->B, then B->C
- Removing a zone from shard should cause it to move chunks out.
- Chunks move out to other shards with the same zone after zone deleted from shard
- Zone with hashed shard key: change from A->B, then B->C
- Zone with compound shard key
- Zone does not align with chunk boundaries (hashed)
- removeShard on last shard with the given zone
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