| ⇢ | A | UnionDiscriminator added | |
| C | ↘ | F | SerializationGraphNavigator got worse |
| ⇢ | A | PropertyMetadata::setUnionDiscriminator() added | |
| ⇢ | A | UnionHandler::isPrimitiveType() added | |
| ⇢ | A | UnionDiscriminator::__construct() added | |
| A | ↘ | B | UnionHandler::deserializeUnion() got worse |
| A | ↛ | UnionHandler::determineType() removed |