| ⇢ | A | Language added | |
| A | ↛ | LanguageCode removed |
| ⇢ | A | Language::getCode() added | |
| ⇢ | A | HttpExceptionFactory::missingMediaType() added | |
| ⇢ | A | HttpExceptionFactory::unsupportedMediaType() added | |
| A | ↘ | B | PayloadDecodingMiddleware::process() got worse |
| A | ↛ | LanguageCode::getCode() removed |