protected function mutateValue($value, $dir = 'setter')
    {
        $mutator = $this->getMutator($value, $dir, $this->attributes['meta_type']);

        if (method_exists($this, $mutator)) {
            return $this->{$mutator}($value);
        }

        return static::$attributeMutator->mutate($value, $mutator);
    }