When defaultFieldMode: 'read' is set, nulled values are not distinguishable from empty strings.

If a field is set to `text({ db: { isNullable: true } }),` and for the schema `itemView: { defaultFieldMode: 'read', },` is active, then the view does not make it clear, if en empty string is set or `null`.

if `defaultFieldMode` is not set to `read`, then you see if the value is actually `null`:

Expected behaviour: Show `null` if `null` is in the database.