This PR removes the RemovedInMarshmallow4Warning warning by updating the code to the new interface of marshmallow.Field.
It was necessary to wrap parameters (load_from, location) into a dictionary to give to the parameter metadata. Further the missing parameter has to be changed to load_default.
This PR removes the RemovedInMarshmallow4Warning warning by updating the code to the new interface of marshmallow.Field.
It was necessary to wrap parameters (load_from, location) into a dictionary to give to the parameter metadata. Further the missing parameter has to be changed to load_default.