CS fixes

Author: nicolas-grekas

Node/Node.php

@@ -87,7 +87,7 @@ public function dump()
         $dump = '';
 
         foreach ($this->toArray() as $v) {
-            $dump .= is_scalar($v) ? $v : $v->dump();
+            $dump .= \is_scalar($v) ? $v : $v->dump();
         }
 
         return $dump;