I have some jdo objects with many to many unowned relationships in the datastore already. This was done with List<Key> and I have many objects already persisted in the datastore. I want to switch this Key collection to Set<Key> in the object however I'm not sure how the datastore will respond to that. Is the datanucleus implementation storing the data in a more abstract Collection manner and then simply building a List or Set each time and populating it, or is it more of a "once a Set always a Set" situation?
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