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e03e5c751c
Previously save() would crash with an attempted forced update message, and both save(force_insert=True) and bulk_create() would crash with DoesNotExist errors trying to retrieve rows with an empty primary key (id IS NULL). Implementing deferred field model instance copying might be doable in certain cases (e.g. when all the deferred fields are db generated) but that's not trivial to implement in a backward compatible way. Thanks Adam Sołtysik for the report and test and Clifford for the review.
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