Merge branch '4.4' into 5.2

* 4.4:
  [4.4] Add missing `@return` annotations
  Handle lock with long key

Author: nicolas-grekas

Loader/Configurator/CollectionConfigurator.php

@@ -38,6 +38,9 @@ public function __construct(RouteCollection $parent, string $name, self $parentC
         $this->parentPrefixes = $parentPrefixes;
     }
 
+    /**
+     * @return array
+     */
     public function __sleep()
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);

Loader/Configurator/ImportConfigurator.php

@@ -30,6 +30,9 @@ public function __construct(RouteCollection $parent, RouteCollection $route)
         $this->route = $route;
     }
 
+    /**
+     * @return array
+     */
     public function __sleep()
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);