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Davis Kirkendall 30ee8e2203 Force fields.Undefined to be a singleton objectIn various places of the code, we compare directly to fields.Undefinedsince we assume it to be constant.When new models get created however, the object is deepcopied andis no longer identical with the original object.We therefore add __copy__ and __deepcopy__ methods to ensurethat the copied objects are actually the same original object. (#1981 )

2020-10-09 13:25:24 +01:00

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Force fields.Undefined to be a singleton object, fixing inherited generic model schemas