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Also, according to the comments on the ticket and its duplicates, added tests execising saving an instance of a model with a GFK to: * An unsaved object -- This actually doesn't generate the same failure but another ORM-level exception. The test verifies it's the case. * An instance of a model with a __nonzero__() method thant returns False for it. This doesn't fail because that code path isn't executed. * An instance of a model with a CharField PK and an empty value for it. This doesn't fail.