| ⇢ | A | RequiredFieldException added | 
| ⇢ | C | CollectionNode::walk() added | |
| ⇢ | B | BaseNode::walk() added | |
| ⇢ | A | RequiredFieldException::__construct() added | |
| ⇢ | A | RequiredFieldException::getField() added | |
| B | ↛ | InputHandler::walk() removed | |
| A | ↛ | CollectionNode::hasChildren() removed |