Add BC layer for updated constructor types

Author: nicolas-grekas

Definition/BaseNode.php

@@ -47,10 +47,7 @@ abstract class BaseNode implements NodeInterface
      */
     public function __construct(?string $name, NodeInterface $parent = null, string $pathSeparator = self::DEFAULT_PATH_SEPARATOR)
     {
-        if (null === $name) {
-            $name = '';
-        }
-        if (false !== strpos($name, $pathSeparator)) {
+        if (false !== strpos($name = (string) $name, $pathSeparator)) {
             throw new \InvalidArgumentException('The name must not contain "'.$pathSeparator.'".');
         }
 

Definition/Builder/NodeDefinition.php

@@ -41,7 +41,7 @@ abstract class NodeDefinition implements NodeParentInterface
     public function __construct(?string $name, NodeParentInterface $parent = null)
     {
         $this->parent = $parent;
-        $this->name = $name ?? '';
+        $this->name = $name;
     }
 
     /**