diff --git a/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php b/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php
index 5bdf54565d647..a6443a3cad48c 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Routing/DelegatingLoader.php
@@ -42,7 +42,7 @@ public function __construct(LoaderResolverInterface $resolver, array $defaultOpt
     /**
      * {@inheritdoc}
      */
-    public function load($resource, string $type = null)
+    public function load(mixed $resource, string $type = null)
     {
         if ($this->loading) {
             // This can happen if a fatal error occurs in parent::load().
diff --git a/src/Symfony/Component/Config/Definition/ArrayNode.php b/src/Symfony/Component/Config/Definition/ArrayNode.php
index d7930b2325828..6e1d96453947a 100644
--- a/src/Symfony/Component/Config/Definition/ArrayNode.php
+++ b/src/Symfony/Component/Config/Definition/ArrayNode.php
@@ -32,9 +32,9 @@ class ArrayNode extends BaseNode implements PrototypeNodeInterface
     protected $removeExtraKeys = true;
     protected $normalizeKeys = true;
 
-    public function setNormalizeKeys($normalizeKeys)
+    public function setNormalizeKeys(bool $normalizeKeys)
     {
-        $this->normalizeKeys = (bool) $normalizeKeys;
+        $this->normalizeKeys = $normalizeKeys;
     }
 
     /**
@@ -46,7 +46,7 @@ public function setNormalizeKeys($normalizeKeys)
      * If you have a mixed key like foo-bar_moo, it will not be altered.
      * The key will also not be altered if the target key already exists.
      */
-    protected function preNormalize($value)
+    protected function preNormalize(mixed $value)
     {
         if (!$this->normalizeKeys || !\is_array($value)) {
             return $value;
@@ -200,7 +200,7 @@ public function addChild(NodeInterface $node)
      * @throws UnsetKeyException
      * @throws InvalidConfigurationException if the node doesn't have enough children
      */
-    protected function finalizeValue($value)
+    protected function finalizeValue(mixed $value)
     {
         if (false === $value) {
             throw new UnsetKeyException(sprintf('Unsetting key for path "%s", value: %s.', $this->getPath(), json_encode($value)));
@@ -246,7 +246,7 @@ protected function finalizeValue($value)
     /**
      * {@inheritdoc}
      */
-    protected function validateType($value)
+    protected function validateType(mixed $value)
     {
         if (!\is_array($value) && (!$this->allowFalse || false !== $value)) {
             $ex = new InvalidTypeException(sprintf('Invalid type for path "%s". Expected "array", but got "%s"', $this->getPath(), get_debug_type($value)));
@@ -264,7 +264,7 @@ protected function validateType($value)
      *
      * @throws InvalidConfigurationException
      */
-    protected function normalizeValue($value)
+    protected function normalizeValue(mixed $value)
     {
         if (false === $value) {
             return $value;
@@ -345,7 +345,7 @@ protected function remapXml(array $value)
      * @throws InvalidConfigurationException
      * @throws \RuntimeException
      */
-    protected function mergeValues($leftSide, $rightSide)
+    protected function mergeValues(mixed $leftSide, mixed $rightSide)
     {
         if (false === $rightSide) {
             // if this is still false after the last config has been merged the
diff --git a/src/Symfony/Component/Config/Definition/BooleanNode.php b/src/Symfony/Component/Config/Definition/BooleanNode.php
index c64ecb8394477..7cf651b21122a 100644
--- a/src/Symfony/Component/Config/Definition/BooleanNode.php
+++ b/src/Symfony/Component/Config/Definition/BooleanNode.php
@@ -23,7 +23,7 @@ class BooleanNode extends ScalarNode
     /**
      * {@inheritdoc}
      */
-    protected function validateType($value)
+    protected function validateType(mixed $value)
     {
         if (!\is_bool($value)) {
             $ex = new InvalidTypeException(sprintf('Invalid type for path "%s". Expected "bool", but got "%s".', $this->getPath(), get_debug_type($value)));
@@ -39,7 +39,7 @@ protected function validateType($value)
     /**
      * {@inheritdoc}
      */
-    protected function isValueEmpty($value)
+    protected function isValueEmpty(mixed $value)
     {
         // a boolean value cannot be empty
         return false;
diff --git a/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php b/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php
index 5609638459a62..48ca041f579d5 100644
--- a/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php
+++ b/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php
@@ -154,7 +154,7 @@ public function addDefaultsIfNotSet()
      *
      * @return $this
      */
-    public function addDefaultChildrenIfNoneSet($children = null)
+    public function addDefaultChildrenIfNoneSet(int|string|array|null $children = null)
     {
         $this->addDefaultChildren = $children;
 
diff --git a/src/Symfony/Component/Config/Definition/Builder/NumericNodeDefinition.php b/src/Symfony/Component/Config/Definition/Builder/NumericNodeDefinition.php
index c4bff1756fb0d..221029cbed891 100644
--- a/src/Symfony/Component/Config/Definition/Builder/NumericNodeDefinition.php
+++ b/src/Symfony/Component/Config/Definition/Builder/NumericNodeDefinition.php
@@ -26,13 +26,11 @@ abstract class NumericNodeDefinition extends ScalarNodeDefinition
     /**
      * Ensures that the value is smaller than the given reference.
      *
-     * @param int|float $max
-     *
      * @return $this
      *
      * @throws \InvalidArgumentException when the constraint is inconsistent
      */
-    public function max($max)
+    public function max(int|float $max)
     {
         if (isset($this->min) && $this->min > $max) {
             throw new \InvalidArgumentException(sprintf('You cannot define a max(%s) as you already have a min(%s).', $max, $this->min));
@@ -45,13 +43,11 @@ public function max($max)
     /**
      * Ensures that the value is bigger than the given reference.
      *
-     * @param int|float $min
-     *
      * @return $this
      *
      * @throws \InvalidArgumentException when the constraint is inconsistent
      */
-    public function min($min)
+    public function min(int|float $min)
     {
         if (isset($this->max) && $this->max < $min) {
             throw new \InvalidArgumentException(sprintf('You cannot define a min(%s) as you already have a max(%s).', $min, $this->max));
diff --git a/src/Symfony/Component/Config/Definition/Dumper/XmlReferenceDumper.php b/src/Symfony/Component/Config/Definition/Dumper/XmlReferenceDumper.php
index a8b18a0239e7b..b927f061de9ae 100644
--- a/src/Symfony/Component/Config/Definition/Dumper/XmlReferenceDumper.php
+++ b/src/Symfony/Component/Config/Definition/Dumper/XmlReferenceDumper.php
@@ -268,10 +268,8 @@ private function writeLine(string $text, int $indent = 0)
 
     /**
      * Renders the string conversion of the value.
-     *
-     * @param mixed $value
      */
-    private function writeValue($value): string
+    private function writeValue(mixed $value): string
     {
         if ('%%%%not_defined%%%%' === $value) {
             return '';
diff --git a/src/Symfony/Component/Config/Definition/EnumNode.php b/src/Symfony/Component/Config/Definition/EnumNode.php
index 822e6b57f1642..1c9ebce1ba642 100644
--- a/src/Symfony/Component/Config/Definition/EnumNode.php
+++ b/src/Symfony/Component/Config/Definition/EnumNode.php
@@ -41,7 +41,7 @@ public function getValues()
     /**
      * {@inheritdoc}
      */
-    protected function finalizeValue($value)
+    protected function finalizeValue(mixed $value)
     {
         $value = parent::finalizeValue($value);
 
diff --git a/src/Symfony/Component/Config/Definition/Exception/InvalidConfigurationException.php b/src/Symfony/Component/Config/Definition/Exception/InvalidConfigurationException.php
index fcaaf49435f9d..ceb5e239bf017 100644
--- a/src/Symfony/Component/Config/Definition/Exception/InvalidConfigurationException.php
+++ b/src/Symfony/Component/Config/Definition/Exception/InvalidConfigurationException.php
@@ -22,7 +22,7 @@ class InvalidConfigurationException extends Exception
     private $path;
     private $containsHints = false;
 
-    public function setPath($path)
+    public function setPath(string $path)
     {
         $this->path = $path;
     }
diff --git a/src/Symfony/Component/Config/Definition/FloatNode.php b/src/Symfony/Component/Config/Definition/FloatNode.php
index 527f996efa168..235927f7b817a 100644
--- a/src/Symfony/Component/Config/Definition/FloatNode.php
+++ b/src/Symfony/Component/Config/Definition/FloatNode.php
@@ -23,7 +23,7 @@ class FloatNode extends NumericNode
     /**
      * {@inheritdoc}
      */
-    protected function validateType($value)
+    protected function validateType(mixed $value)
     {
         // Integers are also accepted, we just cast them
         if (\is_int($value)) {
diff --git a/src/Symfony/Component/Config/Definition/IntegerNode.php b/src/Symfony/Component/Config/Definition/IntegerNode.php
index dfb4cc674dc0b..62643feb4888b 100644
--- a/src/Symfony/Component/Config/Definition/IntegerNode.php
+++ b/src/Symfony/Component/Config/Definition/IntegerNode.php
@@ -23,7 +23,7 @@ class IntegerNode extends NumericNode
     /**
      * {@inheritdoc}
      */
-    protected function validateType($value)
+    protected function validateType(mixed $value)
     {
         if (!\is_int($value)) {
             $ex = new InvalidTypeException(sprintf('Invalid type for path "%s". Expected "int", but got "%s".', $this->getPath(), get_debug_type($value)));
diff --git a/src/Symfony/Component/Config/Definition/NodeInterface.php b/src/Symfony/Component/Config/Definition/NodeInterface.php
index 45f1f681c1ea5..bc6b01c754ddb 100644
--- a/src/Symfony/Component/Config/Definition/NodeInterface.php
+++ b/src/Symfony/Component/Config/Definition/NodeInterface.php
@@ -65,36 +65,29 @@ public function getDefaultValue();
     /**
      * Normalizes a value.
      *
-     * @param mixed $value The value to normalize
-     *
      * @return mixed The normalized value
      *
      * @throws InvalidTypeException if the value type is invalid
      */
-    public function normalize($value);
+    public function normalize(mixed $value);
 
     /**
      * Merges two values together.
      *
-     * @param mixed $leftSide
-     * @param mixed $rightSide
-     *
      * @return mixed The merged value
      *
      * @throws ForbiddenOverwriteException if the configuration path cannot be overwritten
      * @throws InvalidTypeException        if the value type is invalid
      */
-    public function merge($leftSide, $rightSide);
+    public function merge(mixed $leftSide, mixed $rightSide);
 
     /**
      * Finalizes a value.
      *
-     * @param mixed $value The value to finalize
-     *
      * @return mixed The finalized value
      *
      * @throws InvalidTypeException          if the value type is invalid
      * @throws InvalidConfigurationException if the value is invalid configuration
      */
-    public function finalize($value);
+    public function finalize(mixed $value);
 }
diff --git a/src/Symfony/Component/Config/Definition/NumericNode.php b/src/Symfony/Component/Config/Definition/NumericNode.php
index 50d137c2d71fb..4b5eec41a9f24 100644
--- a/src/Symfony/Component/Config/Definition/NumericNode.php
+++ b/src/Symfony/Component/Config/Definition/NumericNode.php
@@ -23,11 +23,7 @@ class NumericNode extends ScalarNode
     protected $min;
     protected $max;
 
-    /**
-     * @param int|float|null $min
-     * @param int|float|null $max
-     */
-    public function __construct(?string $name, NodeInterface $parent = null, $min = null, $max = null, string $pathSeparator = BaseNode::DEFAULT_PATH_SEPARATOR)
+    public function __construct(?string $name, NodeInterface $parent = null, int|float|null $min = null, int|float|null $max = null, string $pathSeparator = BaseNode::DEFAULT_PATH_SEPARATOR)
     {
         parent::__construct($name, $parent, $pathSeparator);
         $this->min = $min;
@@ -37,7 +33,7 @@ public function __construct(?string $name, NodeInterface $parent = null, $min =
     /**
      * {@inheritdoc}
      */
-    protected function finalizeValue($value)
+    protected function finalizeValue(mixed $value)
     {
         $value = parent::finalizeValue($value);
 
@@ -60,7 +56,7 @@ protected function finalizeValue($value)
     /**
      * {@inheritdoc}
      */
-    protected function isValueEmpty($value)
+    protected function isValueEmpty(mixed $value)
     {
         // a numeric value cannot be empty
         return false;
diff --git a/src/Symfony/Component/Config/Definition/PrototypedArrayNode.php b/src/Symfony/Component/Config/Definition/PrototypedArrayNode.php
index 49c90ea9e9e3d..479c6d98bed34 100644
--- a/src/Symfony/Component/Config/Definition/PrototypedArrayNode.php
+++ b/src/Symfony/Component/Config/Definition/PrototypedArrayNode.php
@@ -104,7 +104,7 @@ public function hasDefaultValue()
      *
      * @param int|string|array|null $children The number of children|The child name|The children names to be added
      */
-    public function setAddChildrenIfNoneSet($children = ['defaults'])
+    public function setAddChildrenIfNoneSet(int|string|array|null $children = ['defaults'])
     {
         if (null === $children) {
             $this->defaultChildren = ['defaults'];
@@ -165,7 +165,7 @@ public function addChild(NodeInterface $node)
     /**
      * {@inheritdoc}
      */
-    protected function finalizeValue($value)
+    protected function finalizeValue(mixed $value)
     {
         if (false === $value) {
             throw new UnsetKeyException(sprintf('Unsetting key for path "%s", value: %s.', $this->getPath(), json_encode($value)));
@@ -195,7 +195,7 @@ protected function finalizeValue($value)
      *
      * @throws DuplicateKeyException
      */
-    protected function normalizeValue($value)
+    protected function normalizeValue(mixed $value)
     {
         if (false === $value) {
             return $value;
@@ -262,7 +262,7 @@ protected function normalizeValue($value)
     /**
      * {@inheritdoc}
      */
-    protected function mergeValues($leftSide, $rightSide)
+    protected function mergeValues(mixed $leftSide, mixed $rightSide)
     {
         if (false === $rightSide) {
             // if this is still false after the last config has been merged the
diff --git a/src/Symfony/Component/Config/Definition/ScalarNode.php b/src/Symfony/Component/Config/Definition/ScalarNode.php
index 5296c27960283..798a3aeda7e71 100644
--- a/src/Symfony/Component/Config/Definition/ScalarNode.php
+++ b/src/Symfony/Component/Config/Definition/ScalarNode.php
@@ -30,7 +30,7 @@ class ScalarNode extends VariableNode
     /**
      * {@inheritdoc}
      */
-    protected function validateType($value)
+    protected function validateType(mixed $value)
     {
         if (!is_scalar($value) && null !== $value) {
             $ex = new InvalidTypeException(sprintf('Invalid type for path "%s". Expected "scalar", but got "%s".', $this->getPath(), get_debug_type($value)));
@@ -46,7 +46,7 @@ protected function validateType($value)
     /**
      * {@inheritdoc}
      */
-    protected function isValueEmpty($value)
+    protected function isValueEmpty(mixed $value)
     {
         // assume environment variables are never empty (which in practice is likely to be true during runtime)
         // not doing so breaks many configs that are valid today
diff --git a/src/Symfony/Component/Config/Definition/VariableNode.php b/src/Symfony/Component/Config/Definition/VariableNode.php
index e868ece13e543..5571661012ba8 100644
--- a/src/Symfony/Component/Config/Definition/VariableNode.php
+++ b/src/Symfony/Component/Config/Definition/VariableNode.php
@@ -27,7 +27,7 @@ class VariableNode extends BaseNode implements PrototypeNodeInterface
     protected $defaultValue;
     protected $allowEmptyValue = true;
 
-    public function setDefaultValue($value)
+    public function setDefaultValue(mixed $value)
     {
         $this->defaultValueSet = true;
         $this->defaultValue = $value;
@@ -72,14 +72,14 @@ public function setName(string $name)
     /**
      * {@inheritdoc}
      */
-    protected function validateType($value)
+    protected function validateType(mixed $value)
     {
     }
 
     /**
      * {@inheritdoc}
      */
-    protected function finalizeValue($value)
+    protected function finalizeValue(mixed $value)
     {
         // deny environment variables only when using custom validators
         // this avoids ever passing an empty value to final validation closures
@@ -109,7 +109,7 @@ protected function finalizeValue($value)
     /**
      * {@inheritdoc}
      */
-    protected function normalizeValue($value)
+    protected function normalizeValue(mixed $value)
     {
         return $value;
     }
@@ -117,7 +117,7 @@ protected function normalizeValue($value)
     /**
      * {@inheritdoc}
      */
-    protected function mergeValues($leftSide, $rightSide)
+    protected function mergeValues(mixed $leftSide, mixed $rightSide)
     {
         return $rightSide;
     }
@@ -129,13 +129,11 @@ protected function mergeValues($leftSide, $rightSide)
      * method may be overridden by subtypes to better match their understanding
      * of empty data.
      *
-     * @param mixed $value
-     *
      * @return bool
      *
      * @see finalizeValue()
      */
-    protected function isValueEmpty($value)
+    protected function isValueEmpty(mixed $value)
     {
         return empty($value);
     }
diff --git a/src/Symfony/Component/Config/Exception/LoaderLoadException.php b/src/Symfony/Component/Config/Exception/LoaderLoadException.php
index 7c00284b07a45..cfd5bfe55ed15 100644
--- a/src/Symfony/Component/Config/Exception/LoaderLoadException.php
+++ b/src/Symfony/Component/Config/Exception/LoaderLoadException.php
@@ -73,7 +73,7 @@ public function __construct(string $resource, string $sourceResource = null, int
         parent::__construct($message, $code, $previous);
     }
 
-    protected function varToString($var)
+    protected function varToString(mixed $var)
     {
         if (\is_object($var)) {
             return sprintf('Object(%s)', \get_class($var));
diff --git a/src/Symfony/Component/Config/FileLocator.php b/src/Symfony/Component/Config/FileLocator.php
index da350908a6bd9..21122e52c92e2 100644
--- a/src/Symfony/Component/Config/FileLocator.php
+++ b/src/Symfony/Component/Config/FileLocator.php
@@ -25,7 +25,7 @@ class FileLocator implements FileLocatorInterface
     /**
      * @param string|string[] $paths A path or an array of paths where to look for resources
      */
-    public function __construct($paths = [])
+    public function __construct(string|array $paths = [])
     {
         $this->paths = (array) $paths;
     }
diff --git a/src/Symfony/Component/Config/Loader/DelegatingLoader.php b/src/Symfony/Component/Config/Loader/DelegatingLoader.php
index e5a74ee63b39d..77e483c45e7c5 100644
--- a/src/Symfony/Component/Config/Loader/DelegatingLoader.php
+++ b/src/Symfony/Component/Config/Loader/DelegatingLoader.php
@@ -31,7 +31,7 @@ public function __construct(LoaderResolverInterface $resolver)
     /**
      * {@inheritdoc}
      */
-    public function load($resource, string $type = null)
+    public function load(mixed $resource, string $type = null)
     {
         if (false === $loader = $this->resolver->resolve($resource, $type)) {
             throw new LoaderLoadException($resource, null, 0, null, $type);
@@ -43,7 +43,7 @@ public function load($resource, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports($resource, string $type = null)
+    public function supports(mixed $resource, string $type = null)
     {
         return false !== $this->resolver->resolve($resource, $type);
     }
diff --git a/src/Symfony/Component/Config/Loader/FileLoader.php b/src/Symfony/Component/Config/Loader/FileLoader.php
index 2351f13eda386..5cf51003fad17 100644
--- a/src/Symfony/Component/Config/Loader/FileLoader.php
+++ b/src/Symfony/Component/Config/Loader/FileLoader.php
@@ -70,7 +70,7 @@ public function getLocator()
      * @throws FileLoaderImportCircularReferenceException
      * @throws FileLocatorFileNotFoundException
      */
-    public function import($resource, string $type = null, bool $ignoreErrors = false, string $sourceResource = null, $exclude = null)
+    public function import(mixed $resource, string $type = null, bool $ignoreErrors = false, string $sourceResource = null, string|array|null $exclude = null)
     {
         if (\is_string($resource) && \strlen($resource) !== ($i = strcspn($resource, '*?{[')) && false === strpos($resource, "\n")) {
             $excluded = [];
@@ -133,7 +133,7 @@ protected function glob(string $pattern, bool $recursive, &$resource = null, boo
         yield from $resource;
     }
 
-    private function doImport($resource, string $type = null, bool $ignoreErrors = false, string $sourceResource = null)
+    private function doImport(mixed $resource, string $type = null, bool $ignoreErrors = false, string $sourceResource = null)
     {
         try {
             $loader = $this->resolve($resource, $type);
diff --git a/src/Symfony/Component/Config/Loader/GlobFileLoader.php b/src/Symfony/Component/Config/Loader/GlobFileLoader.php
index fecb1c5d073ac..857b733611102 100644
--- a/src/Symfony/Component/Config/Loader/GlobFileLoader.php
+++ b/src/Symfony/Component/Config/Loader/GlobFileLoader.php
@@ -21,7 +21,7 @@ class GlobFileLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    public function load($resource, string $type = null)
+    public function load(mixed $resource, string $type = null)
     {
         return $this->import($resource);
     }
@@ -29,7 +29,7 @@ public function load($resource, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports($resource, string $type = null)
+    public function supports(mixed $resource, string $type = null)
     {
         return 'glob' === $type;
     }
diff --git a/src/Symfony/Component/Config/Loader/Loader.php b/src/Symfony/Component/Config/Loader/Loader.php
index 3c0fe0846cff6..95f4bf6fef687 100644
--- a/src/Symfony/Component/Config/Loader/Loader.php
+++ b/src/Symfony/Component/Config/Loader/Loader.php
@@ -47,12 +47,9 @@ public function setResolver(LoaderResolverInterface $resolver)
     /**
      * Imports a resource.
      *
-     * @param mixed       $resource A resource
-     * @param string|null $type     The resource type or null if unknown
-     *
      * @return mixed
      */
-    public function import($resource, string $type = null)
+    public function import(mixed $resource, string $type = null)
     {
         return $this->resolve($resource, $type)->load($resource, $type);
     }
@@ -60,14 +57,11 @@ public function import($resource, string $type = null)
     /**
      * Finds a loader able to load an imported resource.
      *
-     * @param mixed       $resource A resource
-     * @param string|null $type     The resource type or null if unknown
-     *
      * @return $this|LoaderInterface
      *
      * @throws LoaderLoadException If no loader is found
      */
-    public function resolve($resource, string $type = null)
+    public function resolve(mixed $resource, string $type = null)
     {
         if ($this->supports($resource, $type)) {
             return $this;
diff --git a/src/Symfony/Component/Config/Loader/LoaderInterface.php b/src/Symfony/Component/Config/Loader/LoaderInterface.php
index fee6f9f1c334c..54848962638c9 100644
--- a/src/Symfony/Component/Config/Loader/LoaderInterface.php
+++ b/src/Symfony/Component/Config/Loader/LoaderInterface.php
@@ -21,13 +21,11 @@ interface LoaderInterface
     /**
      * Loads a resource.
      *
-     * @param mixed $resource The resource
-     *
      * @return mixed
      *
      * @throws \Exception If something went wrong
      */
-    public function load($resource, string $type = null);
+    public function load(mixed $resource, string $type = null);
 
     /**
      * Returns whether this class supports the given resource.
@@ -36,7 +34,7 @@ public function load($resource, string $type = null);
      *
      * @return bool True if this class supports the given resource, false otherwise
      */
-    public function supports($resource, string $type = null);
+    public function supports(mixed $resource, string $type = null);
 
     /**
      * Gets the loader resolver.
diff --git a/src/Symfony/Component/Config/Loader/LoaderResolver.php b/src/Symfony/Component/Config/Loader/LoaderResolver.php
index d243b91d42542..a20ecf43b2d58 100644
--- a/src/Symfony/Component/Config/Loader/LoaderResolver.php
+++ b/src/Symfony/Component/Config/Loader/LoaderResolver.php
@@ -39,7 +39,7 @@ public function __construct(array $loaders = [])
     /**
      * {@inheritdoc}
      */
-    public function resolve($resource, string $type = null)
+    public function resolve(mixed $resource, string $type = null)
     {
         foreach ($this->loaders as $loader) {
             if ($loader->supports($resource, $type)) {
diff --git a/src/Symfony/Component/Config/Loader/LoaderResolverInterface.php b/src/Symfony/Component/Config/Loader/LoaderResolverInterface.php
index 2c45a4cbd79b7..fd5dc693541b5 100644
--- a/src/Symfony/Component/Config/Loader/LoaderResolverInterface.php
+++ b/src/Symfony/Component/Config/Loader/LoaderResolverInterface.php
@@ -21,10 +21,9 @@ interface LoaderResolverInterface
     /**
      * Returns a loader able to load the resource.
      *
-     * @param mixed       $resource A resource
-     * @param string|null $type     The resource type or null if unknown
+     * @param string|null $type The resource type or null if unknown
      *
      * @return LoaderInterface|false The loader or false if none is able to load the resource
      */
-    public function resolve($resource, string $type = null);
+    public function resolve(mixed $resource, string $type = null);
 }
diff --git a/src/Symfony/Component/Config/ResourceCheckerConfigCache.php b/src/Symfony/Component/Config/ResourceCheckerConfigCache.php
index 190ab991acd3d..d47370132e63d 100644
--- a/src/Symfony/Component/Config/ResourceCheckerConfigCache.php
+++ b/src/Symfony/Component/Config/ResourceCheckerConfigCache.php
@@ -181,7 +181,7 @@ private function safelyUnserialize(string $file)
     /**
      * @internal
      */
-    public static function handleUnserializeCallback($class)
+    public static function handleUnserializeCallback(string $class)
     {
         trigger_error('Class not found: '.$class);
     }
diff --git a/src/Symfony/Component/Config/Tests/Definition/ArrayNodeTest.php b/src/Symfony/Component/Config/Tests/Definition/ArrayNodeTest.php
index a5a8a78dc505e..fce5a6b801050 100644
--- a/src/Symfony/Component/Config/Tests/Definition/ArrayNodeTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/ArrayNodeTest.php
@@ -68,11 +68,9 @@ public function ignoreAndRemoveMatrixProvider(): array
     }
 
     /**
-     * @param array|\Exception $expected
-     *
      * @dataProvider ignoreAndRemoveMatrixProvider
      */
-    public function testIgnoreAndRemoveBehaviors(bool $ignore, bool $remove, $expected, string $message = '')
+    public function testIgnoreAndRemoveBehaviors(bool $ignore, bool $remove, array|\Exception $expected, string $message = '')
     {
         if ($expected instanceof \Exception) {
             $this->expectException(\get_class($expected));
diff --git a/src/Symfony/Component/Config/Tests/Definition/Builder/ArrayNodeDefinitionTest.php b/src/Symfony/Component/Config/Tests/Definition/Builder/ArrayNodeDefinitionTest.php
index e307b615315d0..45e3ccf5de249 100644
--- a/src/Symfony/Component/Config/Tests/Definition/Builder/ArrayNodeDefinitionTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/Builder/ArrayNodeDefinitionTest.php
@@ -98,11 +98,9 @@ public function testPrototypedArrayNodeDefaultWhenUsingDefaultChildren()
     }
 
     /**
-     * @param int|array|string|null $args
-     *
      * @dataProvider providePrototypedArrayNodeDefaults
      */
-    public function testPrototypedArrayNodeDefault($args, bool $shouldThrowWhenUsingAttrAsKey, bool $shouldThrowWhenNotUsingAttrAsKey, array $defaults)
+    public function testPrototypedArrayNodeDefault(int|array|string|null $args, bool $shouldThrowWhenUsingAttrAsKey, bool $shouldThrowWhenNotUsingAttrAsKey, array $defaults)
     {
         $node = new ArrayNodeDefinition('root');
         $node
@@ -437,10 +435,7 @@ protected function assertNode(string $expectedName, string $expectedType, NodeDe
         $this->assertSame($expectedName, $this->getField($actualNode, 'name'));
     }
 
-    /**
-     * @param object $object
-     */
-    protected function getField($object, string $field)
+    protected function getField(object $object, string $field)
     {
         $reflection = new \ReflectionProperty($object, $field);
         $reflection->setAccessible(true);
diff --git a/src/Symfony/Component/Config/Tests/Definition/Builder/ExprBuilderTest.php b/src/Symfony/Component/Config/Tests/Definition/Builder/ExprBuilderTest.php
index 74ae972e54aab..21af3b7236075 100644
--- a/src/Symfony/Component/Config/Tests/Definition/Builder/ExprBuilderTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/Builder/ExprBuilderTest.php
@@ -222,8 +222,6 @@ protected function getTestBuilder(): ExprBuilder
      *
      * @param array|null $config The config you want to use for the finalization, if nothing provided
      *                           a simple ['key'=>'value'] will be used
-     *
-     * @return array The finalized config values
      */
     protected function finalizeTestBuilder(NodeDefinition $nodeDefinition, ?array $config = null): array
     {
@@ -254,7 +252,7 @@ protected function returnClosure($val): \Closure
      * @param mixed $value  The value to test
      * @param mixed $config The config values that new to be finalized
      */
-    protected function assertFinalizedValueIs($value, NodeDefinition $nodeDefinition, $config = null)
+    protected function assertFinalizedValueIs($value, NodeDefinition $nodeDefinition, $config = null): void
     {
         $this->assertEquals(['key' => $value], $this->finalizeTestBuilder($nodeDefinition, $config));
     }
diff --git a/src/Symfony/Component/Config/Tests/Definition/FloatNodeTest.php b/src/Symfony/Component/Config/Tests/Definition/FloatNodeTest.php
index d675f47046f90..5a0fccb2868da 100644
--- a/src/Symfony/Component/Config/Tests/Definition/FloatNodeTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/FloatNodeTest.php
@@ -19,10 +19,8 @@ class FloatNodeTest extends TestCase
 {
     /**
      * @dataProvider getValidValues
-     *
-     * @param int|float $value
      */
-    public function testNormalize($value)
+    public function testNormalize(int|float $value)
     {
         $node = new FloatNode('test');
         $this->assertSame($value, $node->normalize($value));
@@ -30,10 +28,8 @@ public function testNormalize($value)
 
     /**
      * @dataProvider getValidValues
-     *
-     * @param int|float $value
      */
-    public function testValidNonEmptyValues($value)
+    public function testValidNonEmptyValues(int|float $value)
     {
         $node = new FloatNode('test');
         $node->setAllowEmptyValue(false);
diff --git a/src/Symfony/Component/Config/Tests/Definition/PrototypedArrayNodeTest.php b/src/Symfony/Component/Config/Tests/Definition/PrototypedArrayNodeTest.php
index b02d6ce6df2d4..e68d9a68a8703 100644
--- a/src/Symfony/Component/Config/Tests/Definition/PrototypedArrayNodeTest.php
+++ b/src/Symfony/Component/Config/Tests/Definition/PrototypedArrayNodeTest.php
@@ -264,7 +264,7 @@ protected function getPrototypeNodeWithDefaultChildren()
      *
      * @dataProvider getDataForKeyRemovedLeftValueOnly
      */
-    public function testMappedAttributeKeyIsRemovedLeftValueOnly($value, $children, array $expected)
+    public function testMappedAttributeKeyIsRemovedLeftValueOnly($value, array $children, array $expected)
     {
         $node = new PrototypedArrayNode('root');
         $node->setKeyAttribute('id', true);
diff --git a/src/Symfony/Component/Config/Tests/Fixtures/Builder/NodeBuilder.php b/src/Symfony/Component/Config/Tests/Fixtures/Builder/NodeBuilder.php
index cb5106844324c..df1bcd45374d4 100644
--- a/src/Symfony/Component/Config/Tests/Fixtures/Builder/NodeBuilder.php
+++ b/src/Symfony/Component/Config/Tests/Fixtures/Builder/NodeBuilder.php
@@ -16,7 +16,7 @@
 
 class NodeBuilder extends BaseNodeBuilder
 {
-    public function barNode($name): NodeDefinition
+    public function barNode(?string $name): NodeDefinition
     {
         return $this->node($name, 'bar');
     }
diff --git a/src/Symfony/Component/Config/Tests/Fixtures/Configuration/CustomNode.php b/src/Symfony/Component/Config/Tests/Fixtures/Configuration/CustomNode.php
index f6c53ceeeb88f..233728cc6f246 100644
--- a/src/Symfony/Component/Config/Tests/Fixtures/Configuration/CustomNode.php
+++ b/src/Symfony/Component/Config/Tests/Fixtures/Configuration/CustomNode.php
@@ -32,17 +32,17 @@ public function getDefaultValue()
         return true;
     }
 
-    public function normalize($value)
+    public function normalize(mixed $value)
     {
         return $value;
     }
 
-    public function merge($leftSide, $rightSide)
+    public function merge(mixed $leftSide, mixed $rightSide)
     {
         return array_merge($leftSide, $rightSide);
     }
 
-    public function finalize($value)
+    public function finalize(mixed $value)
     {
         return $value;
     }
diff --git a/src/Symfony/Component/Config/Tests/Loader/FileLoaderTest.php b/src/Symfony/Component/Config/Tests/Loader/FileLoaderTest.php
index 26e361b293145..4555347754cf7 100644
--- a/src/Symfony/Component/Config/Tests/Loader/FileLoaderTest.php
+++ b/src/Symfony/Component/Config/Tests/Loader/FileLoaderTest.php
@@ -155,12 +155,12 @@ class TestFileLoader extends FileLoader
 {
     private $supports = true;
 
-    public function load($resource, string $type = null)
+    public function load(mixed $resource, string $type = null)
     {
         return $resource;
     }
 
-    public function supports($resource, string $type = null): bool
+    public function supports(mixed $resource, string $type = null): bool
     {
         return $this->supports;
     }
diff --git a/src/Symfony/Component/Config/Tests/Loader/LoaderTest.php b/src/Symfony/Component/Config/Tests/Loader/LoaderTest.php
index 9b163f100fd7b..127e931989311 100644
--- a/src/Symfony/Component/Config/Tests/Loader/LoaderTest.php
+++ b/src/Symfony/Component/Config/Tests/Loader/LoaderTest.php
@@ -104,11 +104,11 @@ public function testImportWithType()
 
 class ProjectLoader1 extends Loader
 {
-    public function load($resource, string $type = null)
+    public function load(mixed $resource, string $type = null)
     {
     }
 
-    public function supports($resource, string $type = null): bool
+    public function supports(mixed $resource, string $type = null): bool
     {
         return \is_string($resource) && 'foo' === pathinfo($resource, \PATHINFO_EXTENSION);
     }
diff --git a/src/Symfony/Component/Config/Tests/Resource/ResourceStub.php b/src/Symfony/Component/Config/Tests/Resource/ResourceStub.php
index 4073566d19f2a..3cf8cfdbfa3dc 100644
--- a/src/Symfony/Component/Config/Tests/Resource/ResourceStub.php
+++ b/src/Symfony/Component/Config/Tests/Resource/ResourceStub.php
@@ -27,7 +27,7 @@ public function __toString(): string
         return 'stub';
     }
 
-    public function isFresh($timestamp): bool
+    public function isFresh(int $timestamp): bool
     {
         return $this->fresh;
     }
diff --git a/src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php b/src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php
index 585f4ade4385a..184917b9eddbb 100644
--- a/src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php
+++ b/src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php
@@ -72,7 +72,7 @@ public function testLoadFile()
             XmlUtils::loadFile($fixtures.'invalid_schema.xml', 'invalid_callback_or_file');
             $this->fail();
         } catch (\InvalidArgumentException $e) {
-            $this->assertStringContainsString('XSD file or callable', $e->getMessage());
+            $this->assertStringContainsString('Invalid XSD file: "invalid_callback_or_file".', $e->getMessage());
         }
 
         $mock = $this->createMock(Validator::class);
@@ -150,7 +150,7 @@ public function getDataForConvertDomToArray(): array
     /**
      * @dataProvider getDataForPhpize
      */
-    public function testPhpize($expected, $value)
+    public function testPhpize($expected, string $value)
     {
         $this->assertSame($expected, XmlUtils::phpize($value));
     }
diff --git a/src/Symfony/Component/Config/Util/XmlUtils.php b/src/Symfony/Component/Config/Util/XmlUtils.php
index ac82c020812df..517ba68221057 100644
--- a/src/Symfony/Component/Config/Util/XmlUtils.php
+++ b/src/Symfony/Component/Config/Util/XmlUtils.php
@@ -44,7 +44,7 @@ private function __construct()
      * @throws InvalidXmlException When parsing of XML with schema or callable produces any errors unrelated to the XML parsing itself
      * @throws \RuntimeException   When DOM extension is missing
      */
-    public static function parse(string $content, $schemaOrCallable = null)
+    public static function parse(string $content, string|callable|null $schemaOrCallable = null)
     {
         if (!\extension_loaded('dom')) {
             throw new \LogicException('Extension DOM is required.');
@@ -80,13 +80,13 @@ public static function parse(string $content, $schemaOrCallable = null)
                 } catch (\Exception $e) {
                     $valid = false;
                 }
-            } elseif (!\is_array($schemaOrCallable) && is_file((string) $schemaOrCallable)) {
+            } elseif (is_file($schemaOrCallable)) {
                 $schemaSource = file_get_contents((string) $schemaOrCallable);
                 $valid = @$dom->schemaValidateSource($schemaSource);
             } else {
                 libxml_use_internal_errors($internalErrors);
 
-                throw new XmlParsingException('The schemaOrCallable argument has to be a valid path to XSD file or callable.');
+                throw new XmlParsingException(sprintf('Invalid XSD file: "%s".', $schemaOrCallable));
             }
 
             if (!$valid) {
@@ -116,7 +116,7 @@ public static function parse(string $content, $schemaOrCallable = null)
      * @throws XmlParsingException       When XML parsing returns any errors
      * @throws \RuntimeException         When DOM extension is missing
      */
-    public static function loadFile(string $file, $schemaOrCallable = null)
+    public static function loadFile(string $file, string|callable|null $schemaOrCallable = null)
     {
         if (!is_file($file)) {
             throw new \InvalidArgumentException(sprintf('Resource "%s" is not a file.', $file));
@@ -213,11 +213,9 @@ public static function convertDomElementToArray(\DOMElement $element, bool $chec
     /**
      * Converts an xml value to a PHP type.
      *
-     * @param mixed $value
-     *
      * @return mixed
      */
-    public static function phpize($value)
+    public static function phpize(string|\Stringable $value)
     {
         $value = (string) $value;
         $lowercaseValue = strtolower($value);
@@ -229,12 +227,12 @@ public static function phpize($value)
                 $raw = $value;
                 $cast = (int) $value;
 
-                return '0' == $value[0] ? octdec($value) : (((string) $raw === (string) $cast) ? $cast : $raw);
+                return '0' == $value[0] ? octdec($value) : (($raw === (string) $cast) ? $cast : $raw);
             case isset($value[1]) && '-' === $value[0] && ctype_digit(substr($value, 1)):
                 $raw = $value;
                 $cast = (int) $value;
 
-                return '0' == $value[1] ? octdec($value) : (((string) $raw === (string) $cast) ? $cast : $raw);
+                return '0' == $value[1] ? octdec($value) : (($raw === (string) $cast) ? $cast : $raw);
             case 'true' === $lowercaseValue:
                 return true;
             case 'false' === $lowercaseValue:
diff --git a/src/Symfony/Component/DependencyInjection/Loader/ClosureLoader.php b/src/Symfony/Component/DependencyInjection/Loader/ClosureLoader.php
index a8337d4e66e62..bfcffd312c883 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/ClosureLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/ClosureLoader.php
@@ -34,7 +34,7 @@ public function __construct(ContainerBuilder $container, string $env = null)
     /**
      * {@inheritdoc}
      */
-    public function load($resource, string $type = null)
+    public function load(mixed $resource, string $type = null)
     {
         $resource($this->container, $this->env);
     }
@@ -42,7 +42,7 @@ public function load($resource, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports($resource, string $type = null)
+    public function supports(mixed $resource, string $type = null)
     {
         return $resource instanceof \Closure;
     }
diff --git a/src/Symfony/Component/DependencyInjection/Loader/DirectoryLoader.php b/src/Symfony/Component/DependencyInjection/Loader/DirectoryLoader.php
index 943986982e344..126a0f4d97f57 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/DirectoryLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/DirectoryLoader.php
@@ -21,7 +21,7 @@ class DirectoryLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    public function load($file, string $type = null)
+    public function load(mixed $file, string $type = null)
     {
         $file = rtrim($file, '/');
         $path = $this->locator->locate($file);
@@ -43,7 +43,7 @@ public function load($file, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports($resource, string $type = null)
+    public function supports(mixed $resource, string $type = null)
     {
         if ('directory' === $type) {
             return true;
diff --git a/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
index 54688910b245d..e7322d7ed1ac2 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
@@ -52,7 +52,7 @@ public function __construct(ContainerBuilder $container, FileLocatorInterface $l
      *
      * @param bool|string $ignoreErrors Whether errors should be ignored; pass "not_found" to ignore only when the loaded resource is not found
      */
-    public function import($resource, string $type = null, $ignoreErrors = false, string $sourceResource = null, $exclude = null)
+    public function import(mixed $resource, string $type = null, bool|string $ignoreErrors = false, string $sourceResource = null, $exclude = null)
     {
         $args = \func_get_args();
 
diff --git a/src/Symfony/Component/DependencyInjection/Loader/GlobFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/GlobFileLoader.php
index 53af9cf2b8a18..2bb85bb31dad4 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/GlobFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/GlobFileLoader.php
@@ -21,7 +21,7 @@ class GlobFileLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    public function load($resource, string $type = null)
+    public function load(mixed $resource, string $type = null)
     {
         foreach ($this->glob($resource, false, $globResource) as $path => $info) {
             $this->import($path);
@@ -33,7 +33,7 @@ public function load($resource, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports($resource, string $type = null)
+    public function supports(mixed $resource, string $type = null)
     {
         return 'glob' === $type;
     }
diff --git a/src/Symfony/Component/DependencyInjection/Loader/IniFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/IniFileLoader.php
index fbf313878b807..4caa62dd21980 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/IniFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/IniFileLoader.php
@@ -24,7 +24,7 @@ class IniFileLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    public function load($resource, string $type = null)
+    public function load(mixed $resource, string $type = null)
     {
         $path = $this->locator->locate($resource);
 
@@ -55,7 +55,7 @@ public function load($resource, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports($resource, string $type = null)
+    public function supports(mixed $resource, string $type = null)
     {
         if (!\is_string($resource)) {
             return false;
diff --git a/src/Symfony/Component/DependencyInjection/Loader/PhpFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/PhpFileLoader.php
index 559b8b162ef60..9cb4048657c1c 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/PhpFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/PhpFileLoader.php
@@ -45,7 +45,7 @@ public function __construct(ContainerBuilder $container, FileLocatorInterface $l
     /**
      * {@inheritdoc}
      */
-    public function load($resource, string $type = null)
+    public function load(mixed $resource, string $type = null)
     {
         // the container and loader variables are exposed to the included file below
         $container = $this->container;
@@ -75,7 +75,7 @@ public function load($resource, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports($resource, string $type = null)
+    public function supports(mixed $resource, string $type = null)
     {
         if (!\is_string($resource)) {
             return false;
diff --git a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
index a9cc5075cb994..60dad8e7e57bd 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
@@ -43,7 +43,7 @@ class XmlFileLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    public function load($resource, string $type = null)
+    public function load(mixed $resource, string $type = null)
     {
         $path = $this->locator->locate($resource);
 
@@ -96,7 +96,7 @@ private function loadXml(\DOMDocument $xml, string $path, \DOMNode $root = null)
     /**
      * {@inheritdoc}
      */
-    public function supports($resource, string $type = null)
+    public function supports(mixed $resource, string $type = null)
     {
         if (!\is_string($resource)) {
             return false;
diff --git a/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
index 8f3924dc4fb3d..38311b45aeb06 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
@@ -117,7 +117,7 @@ class YamlFileLoader extends FileLoader
     /**
      * {@inheritdoc}
      */
-    public function load($resource, string $type = null)
+    public function load(mixed $resource, string $type = null)
     {
         $path = $this->locator->locate($resource);
 
@@ -182,7 +182,7 @@ private function loadContent($content, $path)
     /**
      * {@inheritdoc}
      */
-    public function supports($resource, string $type = null)
+    public function supports(mixed $resource, string $type = null)
     {
         if (!\is_string($resource)) {
             return false;
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
index 3f1503bede8e8..04dc879ef03b8 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
@@ -295,12 +295,12 @@ class TestFileLoader extends FileLoader
 {
     public $autoRegisterAliasesForSinglyImplementedInterfaces = true;
 
-    public function load($resource, string $type = null)
+    public function load(mixed $resource, string $type = null)
     {
         return $resource;
     }
 
-    public function supports($resource, string $type = null): bool
+    public function supports(mixed $resource, string $type = null): bool
     {
         return false;
     }
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/GlobFileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/GlobFileLoaderTest.php
index 2f45c844c568e..032a9af261653 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/GlobFileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/GlobFileLoaderTest.php
@@ -38,7 +38,7 @@ public function testLoadAddsTheGlobResourceToTheContainer()
 
 class GlobFileLoaderWithoutImport extends GlobFileLoader
 {
-    public function import($resource, string $type = null, $ignoreErrors = false, string $sourceResource = null, $exclude = null)
+    public function import(mixed $resource, string $type = null, bool|string $ignoreErrors = false, string $sourceResource = null, $exclude = null)
     {
         return null;
     }
diff --git a/src/Symfony/Component/Routing/Loader/ClosureLoader.php b/src/Symfony/Component/Routing/Loader/ClosureLoader.php
index 320cdc4d8d5d9..631d8888af474 100644
--- a/src/Symfony/Component/Routing/Loader/ClosureLoader.php
+++ b/src/Symfony/Component/Routing/Loader/ClosureLoader.php
@@ -36,7 +36,7 @@ public function load(mixed $closure, string $type = null)
     /**
      * {@inheritdoc}
      */
-    public function supports($resource, string $type = null)
+    public function supports(mixed $resource, string $type = null)
     {
         return $resource instanceof \Closure && (!$type || 'closure' === $type);
     }
diff --git a/src/Symfony/Component/Routing/Loader/ContainerLoader.php b/src/Symfony/Component/Routing/Loader/ContainerLoader.php
index d8730aec61479..2f2511f4e75f8 100644
--- a/src/Symfony/Component/Routing/Loader/ContainerLoader.php
+++ b/src/Symfony/Component/Routing/Loader/ContainerLoader.php
@@ -31,7 +31,7 @@ public function __construct(ContainerInterface $container, string $env = null)
     /**
      * {@inheritdoc}
      */
-    public function supports($resource, string $type = null)
+    public function supports(mixed $resource, string $type = null)
     {
         return 'service' === $type && \is_string($resource);
     }
diff --git a/src/Symfony/Component/Routing/Tests/Loader/GlobFileLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/GlobFileLoaderTest.php
index 29e659300ca88..4cf5d7c810859 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/GlobFileLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/GlobFileLoaderTest.php
@@ -38,7 +38,7 @@ public function testLoadAddsTheGlobResourceToTheContainer()
 
 class GlobFileLoaderWithoutImport extends GlobFileLoader
 {
-    public function import($resource, string $type = null, bool $ignoreErrors = false, string $sourceResource = null, $exclude = null)
+    public function import(mixed $resource, string $type = null, bool $ignoreErrors = false, string $sourceResource = null, $exclude = null)
     {
         return new RouteCollection();
     }
diff --git a/src/Symfony/Component/Routing/Tests/Loader/ObjectLoaderTest.php b/src/Symfony/Component/Routing/Tests/Loader/ObjectLoaderTest.php
index 54d3643b1f584..e086467a87199 100644
--- a/src/Symfony/Component/Routing/Tests/Loader/ObjectLoaderTest.php
+++ b/src/Symfony/Component/Routing/Tests/Loader/ObjectLoaderTest.php
@@ -98,7 +98,7 @@ class TestObjectLoader extends ObjectLoader
 {
     public $loaderMap = [];
 
-    public function supports($resource, string $type = null): bool
+    public function supports(mixed $resource, string $type = null): bool
     {
         return 'service';
     }
diff --git a/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php b/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php
index 2de3164876450..2d890c8c3616a 100644
--- a/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php
+++ b/src/Symfony/Component/Translation/Tests/TranslatorCacheTest.php
@@ -320,7 +320,7 @@ private function createFailingLoader(): LoaderInterface
 
 class StaleResource implements SelfCheckingResourceInterface
 {
-    public function isFresh($timestamp): bool
+    public function isFresh(int $timestamp): bool
     {
         return false;
     }