diff --git a/src/Symfony/Component/Cache/Traits/AbstractTrait.php b/src/Symfony/Component/Cache/Traits/AbstractTrait.php
index 5876c1c393e8d..8006855c5be2c 100644
--- a/src/Symfony/Component/Cache/Traits/AbstractTrait.php
+++ b/src/Symfony/Component/Cache/Traits/AbstractTrait.php
@@ -78,7 +78,7 @@ abstract protected function doDelete(array $ids);
      *
      * @return array|bool The identifiers that failed to be cached or a boolean stating if caching succeeded or not
      */
-    abstract protected function doSave(array $values, $lifetime);
+    abstract protected function doSave(array $values, ?int $lifetime);
 
     /**
      * {@inheritdoc}
diff --git a/src/Symfony/Component/HttpClient/Response/CurlResponse.php b/src/Symfony/Component/HttpClient/Response/CurlResponse.php
index 80709ed8a6a76..e7de360a8e410 100644
--- a/src/Symfony/Component/HttpClient/Response/CurlResponse.php
+++ b/src/Symfony/Component/HttpClient/Response/CurlResponse.php
@@ -15,6 +15,7 @@
 use Symfony\Component\HttpClient\Chunk\FirstChunk;
 use Symfony\Component\HttpClient\Chunk\InformationalChunk;
 use Symfony\Component\HttpClient\Exception\TransportException;
+use Symfony\Component\HttpClient\Internal\ClientState;
 use Symfony\Component\HttpClient\Internal\CurlClientState;
 use Symfony\Contracts\HttpClient\Exception\HttpExceptionInterface;
 use Symfony\Contracts\HttpClient\ResponseInterface;
@@ -242,8 +243,10 @@ private static function schedule(self $response, array &$runningResponses): void
 
     /**
      * {@inheritdoc}
+     *
+     * @param CurlClientState $multi
      */
-    private static function perform(CurlClientState $multi, array &$responses = null): void
+    private static function perform(ClientState $multi, array &$responses = null): void
     {
         if (self::$performing) {
             if ($responses) {
@@ -289,8 +292,10 @@ private static function perform(CurlClientState $multi, array &$responses = null
 
     /**
      * {@inheritdoc}
+     *
+     * @param CurlClientState $multi
      */
-    private static function select(CurlClientState $multi, float $timeout): int
+    private static function select(ClientState $multi, float $timeout): int
     {
         if (\PHP_VERSION_ID < 70123 || (70200 <= \PHP_VERSION_ID && \PHP_VERSION_ID < 70211)) {
             // workaround https://bugs.php.net/76480
diff --git a/src/Symfony/Component/HttpClient/Response/NativeResponse.php b/src/Symfony/Component/HttpClient/Response/NativeResponse.php
index 6fccfbef5a6a8..639957415f0dd 100644
--- a/src/Symfony/Component/HttpClient/Response/NativeResponse.php
+++ b/src/Symfony/Component/HttpClient/Response/NativeResponse.php
@@ -14,6 +14,7 @@
 use Psr\Log\LoggerInterface;
 use Symfony\Component\HttpClient\Chunk\FirstChunk;
 use Symfony\Component\HttpClient\Exception\TransportException;
+use Symfony\Component\HttpClient\Internal\ClientState;
 use Symfony\Component\HttpClient\Internal\NativeClientState;
 use Symfony\Contracts\HttpClient\Exception\HttpExceptionInterface;
 use Symfony\Contracts\HttpClient\ResponseInterface;
@@ -214,8 +215,10 @@ private static function schedule(self $response, array &$runningResponses): void
 
     /**
      * {@inheritdoc}
+     *
+     * @param NativeClientState $multi
      */
-    private static function perform(NativeClientState $multi, array &$responses = null): void
+    private static function perform(ClientState $multi, array &$responses = null): void
     {
         // List of native handles for stream_select()
         if (null !== $responses) {
@@ -326,8 +329,10 @@ private static function perform(NativeClientState $multi, array &$responses = nu
 
     /**
      * {@inheritdoc}
+     *
+     * @param NativeClientState $multi
      */
-    private static function select(NativeClientState $multi, float $timeout): int
+    private static function select(ClientState $multi, float $timeout): int
     {
         $_ = [];