diff --git a/src/Symfony/Component/Config/ConfigCacheFactory.php b/src/Symfony/Component/Config/ConfigCacheFactory.php
index bcec95c11d9c1..11fd3cb3a2d45 100644
--- a/src/Symfony/Component/Config/ConfigCacheFactory.php
+++ b/src/Symfony/Component/Config/ConfigCacheFactory.php
@@ -35,12 +35,8 @@ public function __construct(bool $debug)
     /**
      * {@inheritdoc}
      */
-    public function cache(string $file, $callback)
+    public function cache(string $file, callable $callback)
     {
-        if (!\is_callable($callback)) {
-            throw new \InvalidArgumentException(sprintf('Invalid type for callback argument. Expected callable, but got "%s".', \gettype($callback)));
-        }
-
         $cache = new ConfigCache($file, $this->debug);
         if (!$cache->isFresh()) {
             $callback($cache);
diff --git a/src/Symfony/Component/Config/ConfigCacheFactoryInterface.php b/src/Symfony/Component/Config/ConfigCacheFactoryInterface.php
index 255b85a6575a7..7dfa0f2437972 100644
--- a/src/Symfony/Component/Config/ConfigCacheFactoryInterface.php
+++ b/src/Symfony/Component/Config/ConfigCacheFactoryInterface.php
@@ -28,5 +28,5 @@ interface ConfigCacheFactoryInterface
      *
      * @return ConfigCacheInterface The cache instance
      */
-    public function cache(string $file, $callable);
+    public function cache(string $file, callable $callable);
 }
diff --git a/src/Symfony/Component/Config/Definition/ArrayNode.php b/src/Symfony/Component/Config/Definition/ArrayNode.php
index 9fabdd5628a4c..dfde17bc58070 100644
--- a/src/Symfony/Component/Config/Definition/ArrayNode.php
+++ b/src/Symfony/Component/Config/Definition/ArrayNode.php
@@ -129,7 +129,7 @@ public function setAllowNewKeys(bool $allow)
      */
     public function setPerformDeepMerging(bool $boolean)
     {
-        $this->performDeepMerging = (bool) $boolean;
+        $this->performDeepMerging = $boolean;
     }
 
     /**
diff --git a/src/Symfony/Component/Config/Definition/PrototypeNodeInterface.php b/src/Symfony/Component/Config/Definition/PrototypeNodeInterface.php
index 53ed43667ffce..b160aa94a4963 100644
--- a/src/Symfony/Component/Config/Definition/PrototypeNodeInterface.php
+++ b/src/Symfony/Component/Config/Definition/PrototypeNodeInterface.php
@@ -20,8 +20,6 @@ interface PrototypeNodeInterface extends NodeInterface
 {
     /**
      * Sets the name of the node.
-     *
-     * @param string $name The name of the node
      */
     public function setName(string $name);
 }
diff --git a/src/Symfony/Component/Config/FileLocator.php b/src/Symfony/Component/Config/FileLocator.php
index 345e63e6cd61e..e8d9b5545a8ab 100644
--- a/src/Symfony/Component/Config/FileLocator.php
+++ b/src/Symfony/Component/Config/FileLocator.php
@@ -33,7 +33,7 @@ public function __construct($paths = [])
     /**
      * {@inheritdoc}
      */
-    public function locate(string $name, string $currentPath = null, $first = true)
+    public function locate(string $name, string $currentPath = null, bool $first = true)
     {
         if ('' == $name) {
             throw new \InvalidArgumentException('An empty file name is not valid to be located.');
diff --git a/src/Symfony/Component/Config/ResourceCheckerConfigCacheFactory.php b/src/Symfony/Component/Config/ResourceCheckerConfigCacheFactory.php
index fc1702f3cb89a..e3bc9507903e0 100644
--- a/src/Symfony/Component/Config/ResourceCheckerConfigCacheFactory.php
+++ b/src/Symfony/Component/Config/ResourceCheckerConfigCacheFactory.php
@@ -32,12 +32,8 @@ public function __construct(iterable $resourceCheckers = [])
     /**
      * {@inheritdoc}
      */
-    public function cache(string $file, $callback)
+    public function cache(string $file, callable $callback)
     {
-        if (!\is_callable($callback)) {
-            throw new \InvalidArgumentException(sprintf('Invalid type for callback argument. Expected callable, but got "%s".', \gettype($callback)));
-        }
-
         $cache = new ResourceCheckerConfigCache($file, $this->resourceCheckers);
         if (!$cache->isFresh()) {
             $callback($cache);
diff --git a/src/Symfony/Component/Config/Tests/ConfigCacheFactoryTest.php b/src/Symfony/Component/Config/Tests/ConfigCacheFactoryTest.php
index 24e3224ce5ba0..39bd836a7ad0d 100644
--- a/src/Symfony/Component/Config/Tests/ConfigCacheFactoryTest.php
+++ b/src/Symfony/Component/Config/Tests/ConfigCacheFactoryTest.php
@@ -13,17 +13,18 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Config\ConfigCacheFactory;
+use Symfony\Component\Config\ConfigCacheInterface;
 
 class ConfigCacheFactoryTest extends TestCase
 {
-    /**
-     * @expectedException \InvalidArgumentException
-     * @expectedExceptionMessage Invalid type for callback argument. Expected callable, but got "object".
-     */
-    public function testCacheWithInvalidCallback()
+    public function testCanCreateCache()
     {
         $cacheFactory = new ConfigCacheFactory(true);
 
-        $cacheFactory->cache('file', new \stdClass());
+        $cache = $cacheFactory->cache('file', function (ConfigCacheInterface $cache) {
+            return;
+        });
+
+        $this->assertInstanceOf(ConfigCacheInterface::class, $cache);
     }
 }