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1da499a838
condition of being asked to UPDATE or DELETE on a primary key value that contains NULL in it. [ticket:2127] - Some refinements to attribute history. More changes are pending possibly in 0.8, but for now history has been modified such that scalar history doesn't have a "side effect" of populating None for a non-present value. This allows a slightly better ability to distinguish between a None set and no actual change, affects [ticket:2127] as well. - rewriting the history tests in test_attributes to be individual per operation/assertion. its a huge job so this is partial for the moment.