Merge branch '5.2' into 5.3

* 5.2:
  [5.2] Add missing `@return` annotations
  [4.4] Add missing `@return` annotations
  Handle lock with long key
  #42227 update phpdoc to recommend createIndex over ensureIndex

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

@@ -345,6 +345,9 @@ public function reset()
         $this->multi->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__);

Response/AmpResponse.php

@@ -142,6 +142,9 @@ public function getInfo(string $type = null)
         return null !== $type ? $this->info[$type] ?? null : $this->info;
     }
 
+    /**
+     * @return array
+     */
     public function __sleep()
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);

Response/CommonResponseTrait.php

@@ -127,6 +127,9 @@ public function toStream(bool $throw = true)
         return $stream;
     }
 
+    /**
+     * @return array
+     */
     public function __sleep()
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);

Response/TraceableResponse.php

@@ -44,6 +44,9 @@ public function __construct(HttpClientInterface $client, ResponseInterface $resp
         $this->event = $event;
     }
 
+    /**
+     * @return array
+     */
     public function __sleep()
     {
         throw new \BadMethodCallException('Cannot serialize '.__CLASS__);