Merge branch '4.4' into 5.2

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

Author: nicolas-grekas

Chunk/ErrorChunk.php

@@ -120,6 +120,9 @@ public function didThrow(bool $didThrow = null): bool
         return $this->didThrow;
     }
 
+    /**
+     * @return array
+     */
     public function __sleep()
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);

CurlHttpClient.php

@@ -367,6 +367,9 @@ public function reset()
         }
     }
 
+    /**
+     * @return array
+     */
     public function __sleep()
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);

HttplugClient.php

@@ -218,6 +218,9 @@ public function createUri($uri): UriInterface
         throw new \LogicException(sprintf('You cannot use "%s()" as the "nyholm/psr7" package is not installed. Try running "composer require nyholm/psr7".', __METHOD__));
     }
 
+    /**
+     * @return array
+     */
     public function __sleep()
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);