private function makeSerializable($value)
    {
        if (null === $value) {
            return $value;
        }

        if ($value instanceof Traversable || is_array($value)) {
            $value = ArrayUtils::iteratorToArray($value);

            foreach ($value as $key => $val) {
                $value[$key] = $this->makeSerializable($val);
            }

            return $value;
        }

        if (is_scalar($value)) {
            return $value;
        }

        if (is_resource($value)) {
            return 'resource';
        }

        return new ObjectStub($value);
    }