Validation level to use if the validation fails.
Error message from the config or fall back to the default.
Default to allowing adding.
Current value of the field.
Default to allowing removal.
Current value of the field.
Validates the field using the current value.
If there is an error with the validation, return an error message string to be displayed to the user.
Generated using TypeDoc
Does the rule make the value required?
By default, a validation rule does not make the value required.