diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php
index d8e8468c3f4bc..9f0b0c070a2d9 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php
@@ -57,7 +57,7 @@ protected function setUp(): void
 
     protected function renderForm(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = [])
@@ -66,42 +66,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = [])
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true)
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php
index 0735cc2973e65..38c445f927726 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php
@@ -107,7 +107,7 @@ public function testMoneyWidgetInIso()
 
     protected function renderForm(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = [])
@@ -116,42 +116,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = [])
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true)
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php
index da0564851229a..5c2e5afcfdf99 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php
@@ -59,7 +59,7 @@ protected function setUp(): void
 
     protected function renderForm(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = [])
@@ -68,42 +68,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = [])
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true)
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php
index f62e903473ca5..7dda79420ca12 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php
@@ -111,7 +111,7 @@ public function testMoneyWidgetInIso()
 
     protected function renderForm(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = [])
@@ -120,42 +120,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = [])
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true)
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php
index 9e7b1684b8265..ff9357627579c 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionDivLayoutTest.php
@@ -298,7 +298,7 @@ public function testHelpHtmlIsTrue()
 
     protected function renderForm(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = [])
@@ -307,42 +307,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = [])
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true)
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php
index ecf3597b311a8..301a74ed94449 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionTableLayoutTest.php
@@ -184,7 +184,7 @@ public function testHelpHtmlIsTrue()
 
     protected function renderForm(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form', $vars);
+        return $this->renderer->renderBlock($view, 'form', $vars);
     }
 
     protected function renderLabel(FormView $view, $label = null, array $vars = [])
@@ -193,42 +193,42 @@ protected function renderLabel(FormView $view, $label = null, array $vars = [])
             $vars += ['label' => $label];
         }
 
-        return (string) $this->renderer->searchAndRenderBlock($view, 'label', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'label', $vars);
     }
 
     protected function renderHelp(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'help');
+        return $this->renderer->searchAndRenderBlock($view, 'help');
     }
 
     protected function renderErrors(FormView $view)
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'errors');
+        return $this->renderer->searchAndRenderBlock($view, 'errors');
     }
 
     protected function renderWidget(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'widget', $vars);
     }
 
     protected function renderRow(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'row', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'row', $vars);
     }
 
     protected function renderRest(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
+        return $this->renderer->searchAndRenderBlock($view, 'rest', $vars);
     }
 
     protected function renderStart(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_start', $vars);
+        return $this->renderer->renderBlock($view, 'form_start', $vars);
     }
 
     protected function renderEnd(FormView $view, array $vars = [])
     {
-        return (string) $this->renderer->renderBlock($view, 'form_end', $vars);
+        return $this->renderer->renderBlock($view, 'form_end', $vars);
     }
 
     protected function setTheme(FormView $view, array $themes, $useDefaultThemes = true)
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TimedPhpEngineTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TimedPhpEngineTest.php
index 4951b46c45137..2db6d689530ff 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TimedPhpEngineTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Templating/TimedPhpEngineTest.php
@@ -31,7 +31,7 @@ public function testThatRenderLogsTime()
         $container = $this->createMock(Container::class);
         $templateNameParser = $this->getTemplateNameParser();
         $globalVariables = $this->getGlobalVariables();
-        $loader = $this->getLoader($this->getStorage());
+        $loader = $this->getLoader(new StringStorage('foo'));
 
         $stopwatch = new Stopwatch();
 
@@ -60,17 +60,7 @@ private function getGlobalVariables(): GlobalVariables
         return $this->createMock(GlobalVariables::class);
     }
 
-    private function getStorage(): StringStorage
-    {
-        return $this->getMockBuilder(StringStorage::class)
-            ->disableOriginalConstructor()
-            ->getMockForAbstractClass();
-    }
-
-    /**
-     * @param StringStorage $storage
-     */
-    private function getLoader($storage): Loader
+    private function getLoader(StringStorage $storage): Loader
     {
         $loader = $this->getMockForAbstractClass(Loader::class);
         $loader->expects($this->once())
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
index 22f3a8fa54351..1996249a72070 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
@@ -730,7 +730,7 @@ private function createExpression(ContainerBuilder $container, string $expressio
     private function createRequestMatcher(ContainerBuilder $container, string $path = null, string $host = null, int $port = null, array $methods = [], array $ips = null, array $attributes = []): Reference
     {
         if ($methods) {
-            $methods = array_map('strtoupper', (array) $methods);
+            $methods = array_map('strtoupper', $methods);
         }
 
         if (null !== $ips) {
diff --git a/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php b/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php
index a5127a25d823c..dda4ae6e82f32 100644
--- a/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php
+++ b/src/Symfony/Bundle/TwigBundle/Controller/ExceptionController.php
@@ -64,7 +64,7 @@ public function showAction(Request $request, FlattenException $exception, DebugL
         $code = $exception->getStatusCode();
 
         return new Response($this->twig->render(
-            (string) $this->findTemplate($request, $request->getRequestFormat(), $code, $showException),
+            $this->findTemplate($request, $request->getRequestFormat(), $code, $showException),
             [
                 'status_code' => $code,
                 'status_text' => Response::$statusTexts[$code] ?? '',
diff --git a/src/Symfony/Component/Config/Resource/ClassExistenceResource.php b/src/Symfony/Component/Config/Resource/ClassExistenceResource.php
index 8179ce7fb4f1e..f04b767e7f704 100644
--- a/src/Symfony/Component/Config/Resource/ClassExistenceResource.php
+++ b/src/Symfony/Component/Config/Resource/ClassExistenceResource.php
@@ -38,7 +38,7 @@ public function __construct(string $resource, bool $exists = null)
     {
         $this->resource = $resource;
         if (null !== $exists) {
-            $this->exists = [(bool) $exists, null];
+            $this->exists = [$exists, null];
         }
     }
 
diff --git a/src/Symfony/Component/Config/Util/XmlUtils.php b/src/Symfony/Component/Config/Util/XmlUtils.php
index 12caa486bfc4c..41fb5a9e6259b 100644
--- a/src/Symfony/Component/Config/Util/XmlUtils.php
+++ b/src/Symfony/Component/Config/Util/XmlUtils.php
@@ -239,12 +239,12 @@ 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/XmlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
index 968a3f5eebff5..fdf4fa1f4c887 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
@@ -197,7 +197,7 @@ private function parseDefinition(\DOMElement $service, string $file, array $defa
         if ($alias = $service->getAttribute('alias')) {
             $this->validateAlias($service, $file);
 
-            $this->container->setAlias((string) $service->getAttribute('id'), $alias = new Alias($alias));
+            $this->container->setAlias($service->getAttribute('id'), $alias = new Alias($alias));
             if ($publicAttr = $service->getAttribute('public')) {
                 $alias->setPublic(XmlUtils::phpize($publicAttr));
             } elseif (isset($defaults['public'])) {
@@ -345,7 +345,7 @@ private function parseDefinition(\DOMElement $service, string $file, array $defa
             }
 
             if ('' === $tag->getAttribute('name')) {
-                throw new InvalidArgumentException(sprintf('The tag name for service "%s" in "%s" must be a non-empty string.', (string) $service->getAttribute('id'), $file));
+                throw new InvalidArgumentException(sprintf('The tag name for service "%s" in "%s" must be a non-empty string.', $service->getAttribute('id'), $file));
             }
 
             $definition->addTag($tag->getAttribute('name'), $parameters);
@@ -374,7 +374,7 @@ private function parseDefinition(\DOMElement $service, string $file, array $defa
             } elseif ('null' === $decorationOnInvalid) {
                 $invalidBehavior = ContainerInterface::NULL_ON_INVALID_REFERENCE;
             } else {
-                throw new InvalidArgumentException(sprintf('Invalid value "%s" for attribute "decoration-on-invalid" on service "%s". Did you mean "exception", "ignore" or "null" in "%s"?', $decorationOnInvalid, (string) $service->getAttribute('id'), $file));
+                throw new InvalidArgumentException(sprintf('Invalid value "%s" for attribute "decoration-on-invalid" on service "%s". Did you mean "exception", "ignore" or "null" in "%s"?', $decorationOnInvalid, $service->getAttribute('id'), $file));
             }
 
             $renameId = $service->hasAttribute('decoration-inner-name') ? $service->getAttribute('decoration-inner-name') : null;
diff --git a/src/Symfony/Component/ErrorHandler/ErrorHandler.php b/src/Symfony/Component/ErrorHandler/ErrorHandler.php
index e6e21d601700e..4c4d7dc361cb9 100644
--- a/src/Symfony/Component/ErrorHandler/ErrorHandler.php
+++ b/src/Symfony/Component/ErrorHandler/ErrorHandler.php
@@ -342,7 +342,7 @@ public function scopeAt(int $levels, bool $replace = false): int
     public function traceAt(int $levels, bool $replace = false): int
     {
         $prev = $this->tracedErrors;
-        $this->tracedErrors = (int) $levels;
+        $this->tracedErrors = $levels;
         if (!$replace) {
             $this->tracedErrors |= $prev;
         }
diff --git a/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php b/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
index a18e6185beeec..8508ab707b9a3 100644
--- a/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
+++ b/src/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
@@ -64,7 +64,7 @@ public function current()
         // the logic here avoids redoing the same work in all iterations
 
         if (null === $subPathname = $this->subPath) {
-            $subPathname = $this->subPath = (string) $this->getSubPath();
+            $subPathname = $this->subPath = $this->getSubPath();
         }
         if ('' !== $subPathname) {
             $subPathname .= $this->directorySeparator;
diff --git a/src/Symfony/Component/HttpFoundation/Request.php b/src/Symfony/Component/HttpFoundation/Request.php
index e2586f9a91a6b..b6e6c3036b80f 100644
--- a/src/Symfony/Component/HttpFoundation/Request.php
+++ b/src/Symfony/Component/HttpFoundation/Request.php
@@ -1907,7 +1907,7 @@ protected function preparePathInfo()
             return '/';
         }
 
-        return (string) $pathInfo;
+        return $pathInfo;
     }
 
     /**
diff --git a/src/Symfony/Component/HttpFoundation/Session/Flash/AutoExpireFlashBag.php b/src/Symfony/Component/HttpFoundation/Session/Flash/AutoExpireFlashBag.php
index 6502f3d50155f..facbe102d5408 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Flash/AutoExpireFlashBag.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Flash/AutoExpireFlashBag.php
@@ -78,7 +78,7 @@ public function peek($type, array $default = [])
      */
     public function peekAll()
     {
-        return \array_key_exists('display', $this->flashes) ? (array) $this->flashes['display'] : [];
+        return \array_key_exists('display', $this->flashes) ? $this->flashes['display'] : [];
     }
 
     /**
diff --git a/src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/SessionHandlerProxy.php b/src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/SessionHandlerProxy.php
index 5535bc96441db..9b0cdeb7fe1d0 100644
--- a/src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/SessionHandlerProxy.php
+++ b/src/Symfony/Component/HttpFoundation/Session/Storage/Proxy/SessionHandlerProxy.php
@@ -21,7 +21,7 @@ class SessionHandlerProxy extends AbstractProxy implements \SessionHandlerInterf
     public function __construct(\SessionHandlerInterface $handler)
     {
         $this->handler = $handler;
-        $this->wrapper = ($handler instanceof \SessionHandler);
+        $this->wrapper = $handler instanceof \SessionHandler;
         $this->saveHandlerName = $this->wrapper ? ini_get('session.save_handler') : 'user';
     }
 
@@ -41,7 +41,7 @@ public function getHandler()
     #[\ReturnTypeWillChange]
     public function open($savePath, $sessionName)
     {
-        return (bool) $this->handler->open($savePath, $sessionName);
+        return $this->handler->open($savePath, $sessionName);
     }
 
     /**
@@ -50,16 +50,16 @@ public function open($savePath, $sessionName)
     #[\ReturnTypeWillChange]
     public function close()
     {
-        return (bool) $this->handler->close();
+        return $this->handler->close();
     }
 
     /**
-     * @return string
+     * @return string|false
      */
     #[\ReturnTypeWillChange]
     public function read($sessionId)
     {
-        return (string) $this->handler->read($sessionId);
+        return $this->handler->read($sessionId);
     }
 
     /**
@@ -68,7 +68,7 @@ public function read($sessionId)
     #[\ReturnTypeWillChange]
     public function write($sessionId, $data)
     {
-        return (bool) $this->handler->write($sessionId, $data);
+        return $this->handler->write($sessionId, $data);
     }
 
     /**
@@ -77,7 +77,7 @@ public function write($sessionId, $data)
     #[\ReturnTypeWillChange]
     public function destroy($sessionId)
     {
-        return (bool) $this->handler->destroy($sessionId);
+        return $this->handler->destroy($sessionId);
     }
 
     /**
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
index 2a3f6ce514f46..1fb226d13c38f 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/RequestDataCollector.php
@@ -150,7 +150,7 @@ public function collect(Request $request, Response $response/*, \Throwable $exce
                     'method' => $request->getMethod(),
                     'controller' => $this->parseController($request->attributes->get('_controller')),
                     'status_code' => $statusCode,
-                    'status_text' => Response::$statusTexts[(int) $statusCode],
+                    'status_text' => Response::$statusTexts[$statusCode],
                 ]),
                 0, '/', null, $request->isSecure(), true, false, 'lax'
             ));
diff --git a/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php b/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
index 0424d5e20f4c1..3ec7eb343e04e 100644
--- a/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
+++ b/src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
@@ -272,7 +272,7 @@ public function __construct(?string $locale = 'en', int $style = null, $pattern
             throw new MethodArgumentNotImplementedException(__METHOD__, 'pattern');
         }
 
-        $this->style = null !== $style ? (int) $style : null;
+        $this->style = $style;
     }
 
     /**
@@ -796,8 +796,6 @@ private function isInitializedAttribute(string $attr): bool
      */
     private function convertValueDataType($value, int $type)
     {
-        $type = (int) $type;
-
         if (self::TYPE_DOUBLE === $type) {
             $value = (float) $value;
         } elseif (self::TYPE_INT32 === $type) {
diff --git a/src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php b/src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php
index f392b3da50bac..7feb599fc5678 100644
--- a/src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php
+++ b/src/Symfony/Component/Intl/Tests/NumberFormatter/AbstractNumberFormatterTest.php
@@ -674,12 +674,12 @@ public function parseProvider()
         return [
             ['prefix1', false, '->parse() does not parse a number with a string prefix.', 0],
             ['prefix1', false, '->parse() does not parse a number with a string prefix.', 0, false],
-            ['1.4suffix', (float) 1.4, '->parse() parses a number with a string suffix.', 3],
-            ['1.4suffix', (float) 1.4, '->parse() parses a number with a string suffix.', 3, false],
+            ['1.4suffix', 1.4, '->parse() parses a number with a string suffix.', 3],
+            ['1.4suffix', 1.4, '->parse() parses a number with a string suffix.', 3, false],
             ['1,234.4suffix', 1234.4, '->parse() parses a number with a string suffix.', 7],
             ['1,234.4suffix', 1.0, '->parse() parses a number with a string suffix.', 1, false],
-            ['-.4suffix', (float) -0.4, '->parse() parses a negative dot float with suffix.', 3],
-            ['-.4suffix', (float) -0.4, '->parse() parses a negative dot float with suffix.', 3, false],
+            ['-.4suffix', -0.4, '->parse() parses a negative dot float with suffix.', 3],
+            ['-.4suffix', -0.4, '->parse() parses a negative dot float with suffix.', 3, false],
             [',4', false, '->parse() does not parse when invalid grouping used.', 0],
             [',4', false, '->parse() does not parse when invalid grouping used.', 0, false],
             ['123,4', false, '->parse() does not parse when invalid grouping used.', 0],
diff --git a/src/Symfony/Component/Messenger/Transport/RedisExt/Connection.php b/src/Symfony/Component/Messenger/Transport/RedisExt/Connection.php
index 340cd792d3c06..4e372eecd72f8 100644
--- a/src/Symfony/Component/Messenger/Transport/RedisExt/Connection.php
+++ b/src/Symfony/Component/Messenger/Transport/RedisExt/Connection.php
@@ -267,7 +267,7 @@ public function add(string $body, array $headers, int $delayInMs = 0): void
                     throw new TransportException(json_last_error_msg());
                 }
 
-                $score = (int) ($this->getCurrentTimeInMilliseconds() + $delayInMs);
+                $score = $this->getCurrentTimeInMilliseconds() + $delayInMs;
                 $added = $this->connection->zadd($this->queue, ['NX'], $score, $message);
             } else {
                 $message = json_encode([
diff --git a/src/Symfony/Component/Templating/Storage/Storage.php b/src/Symfony/Component/Templating/Storage/Storage.php
index 8c817ba5b0187..459c45c947d56 100644
--- a/src/Symfony/Component/Templating/Storage/Storage.php
+++ b/src/Symfony/Component/Templating/Storage/Storage.php
@@ -35,7 +35,7 @@ public function __construct(string $template)
      */
     public function __toString()
     {
-        return (string) $this->template;
+        return $this->template;
     }
 
     /**
diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index cb68755404224..24c802bcfa338 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -653,7 +653,7 @@ private static function evaluateScalar(string $scalar, int $flags, array &$refer
             // no break
             case '+' === $scalar[0] || '-' === $scalar[0] || '.' === $scalar[0] || is_numeric($scalar[0]):
                 if (Parser::preg_match('{^[+-]?[0-9][0-9_]*$}', $scalar)) {
-                    $scalar = str_replace('_', '', (string) $scalar);
+                    $scalar = str_replace('_', '', $scalar);
                 }
 
                 switch (true) {