protected function mutatorNameOrFail(string $name, string $operator): string
    {
        if (! $this->hasMutator($name, $operator)) {
            throw new DynamicMutatorNotDefinedException('Mutator not defined!', 0, null, [
                'name'     => $name,
                'operator' => $operator,
                'handler'  => $this->getName(),
            ]);
        }

        return $name;
    }