datapackage.json - metadata - previous_value field

[odscjames]

Currently has required=true - is that right?

What happens when creating a new record and wanting to record that creation - in that case previous_value would be empty?

Or just adding a new field to an existing record - eg a postal_address record with address_1="100 high street", later on someone finds out the postal_code is "02757" and does an edit to add it to the existing record?

Is there a subtlety here around "required but null allowed"? If so it's one that https://pypi.org/project/frictionless/ doesn't recognise - it reports errors when trying to validate data