Bug Application for Symfony ObjectMapper

Step to reproduce the bug

1. Clone this repository
2. run composer install
3. run symfony serve
4. Make a POST request with data :

curl -X POST http://localhost:8000 -H 'Accept: application/json' -H 'Content-Type: application/json' -d '{"data": [{"value": "my_value"}]}'

5. See that you have an error

Fixing

1. Rename services.yaml into services.back.yaml
2. Rename services.fixed.yaml into services.yaml
3. Change new MapCollection() into MapCollection::class in DataDto.php
4. Run the same request as previously
5. See that it works fine
6. Check you have pass thought setter value as value in final object of response