diff --git a/src/Symfony/Component/Cache/Adapter/Psr16Adapter.php b/src/Symfony/Component/Cache/Adapter/Psr16Adapter.php
index bb38871019d2..aa93dfef0fb5 100644
--- a/src/Symfony/Component/Cache/Adapter/Psr16Adapter.php
+++ b/src/Symfony/Component/Cache/Adapter/Psr16Adapter.php
@@ -79,7 +79,7 @@ protected function doDelete(array $ids)
     /**
      * {@inheritdoc}
      */
-    protected function doSave(array $values, $lifetime)
+    protected function doSave(array $values, ?int $lifetime)
     {
         return $this->pool->setMultiple($values, 0 === $lifetime ? null : $lifetime);
     }
diff --git a/src/Symfony/Component/Cache/Traits/AbstractTrait.php b/src/Symfony/Component/Cache/Traits/AbstractTrait.php
index 5876c1c393e8..8006855c5be2 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/Cache/Traits/ApcuTrait.php b/src/Symfony/Component/Cache/Traits/ApcuTrait.php
index f681c0596f94..4e1acc16274a 100644
--- a/src/Symfony/Component/Cache/Traits/ApcuTrait.php
+++ b/src/Symfony/Component/Cache/Traits/ApcuTrait.php
@@ -101,7 +101,7 @@ protected function doDelete(array $ids)
     /**
      * {@inheritdoc}
      */
-    protected function doSave(array $values, $lifetime)
+    protected function doSave(array $values, ?int $lifetime)
     {
         try {
             if (false === $failures = apcu_store($values, null, $lifetime)) {
diff --git a/src/Symfony/Component/Cache/Traits/DoctrineTrait.php b/src/Symfony/Component/Cache/Traits/DoctrineTrait.php
index c87ecabafc80..f795e67868e6 100644
--- a/src/Symfony/Component/Cache/Traits/DoctrineTrait.php
+++ b/src/Symfony/Component/Cache/Traits/DoctrineTrait.php
@@ -91,7 +91,7 @@ protected function doDelete(array $ids)
     /**
      * {@inheritdoc}
      */
-    protected function doSave(array $values, $lifetime)
+    protected function doSave(array $values, ?int $lifetime)
     {
         return $this->provider->saveMultiple($values, $lifetime);
     }
diff --git a/src/Symfony/Component/Cache/Traits/FilesystemTrait.php b/src/Symfony/Component/Cache/Traits/FilesystemTrait.php
index acf3ea0b9813..fe8ab2bda3e5 100644
--- a/src/Symfony/Component/Cache/Traits/FilesystemTrait.php
+++ b/src/Symfony/Component/Cache/Traits/FilesystemTrait.php
@@ -91,7 +91,7 @@ protected function doHave($id)
     /**
      * {@inheritdoc}
      */
-    protected function doSave(array $values, $lifetime)
+    protected function doSave(array $values, ?int $lifetime)
     {
         $expiresAt = $lifetime ? (time() + $lifetime) : 0;
         $values = $this->marshaller->marshall($values, $failed);
diff --git a/src/Symfony/Component/Cache/Traits/MemcachedTrait.php b/src/Symfony/Component/Cache/Traits/MemcachedTrait.php
index ca26f7e4ff7f..89abe35d6ad1 100644
--- a/src/Symfony/Component/Cache/Traits/MemcachedTrait.php
+++ b/src/Symfony/Component/Cache/Traits/MemcachedTrait.php
@@ -223,7 +223,7 @@ public static function createConnection($servers, array $options = [])
     /**
      * {@inheritdoc}
      */
-    protected function doSave(array $values, $lifetime)
+    protected function doSave(array $values, ?int $lifetime)
     {
         if (!$values = $this->marshaller->marshall($values, $failed)) {
             return $failed;
diff --git a/src/Symfony/Component/Cache/Traits/PdoTrait.php b/src/Symfony/Component/Cache/Traits/PdoTrait.php
index 9b03f1cd2c08..5970ec430393 100644
--- a/src/Symfony/Component/Cache/Traits/PdoTrait.php
+++ b/src/Symfony/Component/Cache/Traits/PdoTrait.php
@@ -275,7 +275,7 @@ protected function doDelete(array $ids)
     /**
      * {@inheritdoc}
      */
-    protected function doSave(array $values, $lifetime)
+    protected function doSave(array $values, ?int $lifetime)
     {
         if (!$values = $this->marshaller->marshall($values, $failed)) {
             return $failed;
diff --git a/src/Symfony/Component/Cache/Traits/PhpFilesTrait.php b/src/Symfony/Component/Cache/Traits/PhpFilesTrait.php
index 6f8c45ee513b..567bea1d1b49 100644
--- a/src/Symfony/Component/Cache/Traits/PhpFilesTrait.php
+++ b/src/Symfony/Component/Cache/Traits/PhpFilesTrait.php
@@ -194,7 +194,7 @@ protected function doHave($id)
     /**
      * {@inheritdoc}
      */
-    protected function doSave(array $values, $lifetime)
+    protected function doSave(array $values, ?int $lifetime)
     {
         $ok = true;
         $expiry = $lifetime ? time() + $lifetime : 'PHP_INT_MAX';
diff --git a/src/Symfony/Component/Cache/Traits/RedisTrait.php b/src/Symfony/Component/Cache/Traits/RedisTrait.php
index 2288fcddf635..bd506999b6db 100644
--- a/src/Symfony/Component/Cache/Traits/RedisTrait.php
+++ b/src/Symfony/Component/Cache/Traits/RedisTrait.php
@@ -404,7 +404,7 @@ protected function doDelete(array $ids)
     /**
      * {@inheritdoc}
      */
-    protected function doSave(array $values, $lifetime)
+    protected function doSave(array $values, ?int $lifetime)
     {
         if (!$values = $this->marshaller->marshall($values, $failed)) {
             return $failed;
diff --git a/src/Symfony/Component/HttpClient/Response/CurlResponse.php b/src/Symfony/Component/HttpClient/Response/CurlResponse.php
index 80709ed8a6a7..e7de360a8e41 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 6fccfbef5a6a..639957415f0d 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
     {
         $_ = [];