Merge branch '4.4' into 5.2

* 4.4:
  Switched to non-null defaults in exception constructors
  [Routing] fix conflict with param named class in attribute
  [Cache] fix setting items' metadata on commit()

Exception/CommandNotFoundException.php

@@ -21,10 +21,10 @@ class CommandNotFoundException extends \InvalidArgumentException implements Exce
     private $alternatives;
 
     /**
-     * @param string     $message      Exception message to throw
-     * @param array      $alternatives List of similar defined names
-     * @param int        $code         Exception code
-     * @param \Throwable $previous     Previous exception used for the exception chaining
+     * @param string          $message      Exception message to throw
+     * @param string[]        $alternatives List of similar defined names
+     * @param int             $code         Exception code
+     * @param \Throwable|null $previous     Previous exception used for the exception chaining
      */
     public function __construct(string $message, array $alternatives = [], int $code = 0, \Throwable $previous = null)
     {
@@ -34,7 +34,7 @@ public function __construct(string $message, array $alternatives = [], int $code
     }
 
     /**
-     * @return array A list of similar defined names
+     * @return string[] A list of similar defined names
      */
     public function getAlternatives()
     {