1. identify 2 fields to be used in test:
   • null one with null default value
   • not_null one with empty string as default value

Part 1

1. create new record with both fields filled-in > confirm that data is stored in db as-is
2. edit record and remove value from both fields > confirm that data is stored in db as-is (before NULL was stored in null field instead of empty string)

Part 2

1. change default field for both fields to non-empty string
2. create record without changing default value of these fields > confirm that data is stored in db as-is
3. edit record and remove value from both fields > confirm that data is stored in db as-is (before not null field would revert to default non-empty value)
4. create record and immediately clear both fields > confirm that data is stored in db as-is (before not null field would revert to default non-empty value)

Part 3

1. repeat all of above for numeric field (in previous diff there was a side effect, that empty string would be stored as 0 in numeric field instead of null)