diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 5b8efba407..b64aa797a5 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -1,8 +1,11 @@
 CONTRIBUTORS
 ============
 
-Symfony is the result of the work of many people who made the code better
-(see https://symfony.com/contributors for more information):
+Symfony is the result of the work of many people who made the code better.
+
+The Symfony Connect username in parenthesis allows to get more information
+about contributors (like https://connect.symfony.com/profile/fabpot). See
+https://symfony.com/contributors for more information.
 
  - Fabien Potencier (fabpot)
  - Nicolas Grekas (nicolas-grekas)
diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/config/annotations.php b/src/Symfony/Bundle/FrameworkBundle/Resources/config/annotations.php
index cc66f6f605..6a230c8340 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Resources/config/annotations.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/config/annotations.php
@@ -61,6 +61,7 @@ return static function (ContainerConfigurator $container) {
                         service('cache.annotations'),
                     ]),
             ])
+            ->tag('container.hot_path')
 
         ->alias('annotation_reader', 'annotations.reader')
         ->alias(Reader::class, 'annotation_reader');
diff --git a/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php b/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
index 038d8722b7..b70437374a 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Routing/Router.php
@@ -180,14 +180,16 @@ class Router extends BaseRouter implements WarmableInterface, ServiceSubscriberI
 
             $resolved = ($this->paramFetcher)($match[1]);
 
-            if (\is_bool($resolved)) {
-                $resolved = (string) (int) $resolved;
-            }
-
-            if (\is_string($resolved) || is_numeric($resolved)) {
+            if (is_scalar($resolved)) {
                 $this->collectedParameters[$match[1]] = $resolved;
 
-                return (string) $this->resolve($resolved);
+                if (\is_string($resolved)) {
+                    $resolved = $this->resolve($resolved);
+                }
+
+                if (is_scalar($resolved)) {
+                    return false === $resolved ? '0' : (string) $resolved;
+                }
             }
 
             throw new RuntimeException(sprintf('The container parameter "%s", used in the route configuration value "%s", must be a string or numeric, but it is of type "%s".', $match[1], $value, get_debug_type($resolved)));
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/Fixtures/with_condition.yaml b/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/Fixtures/with_condition.yaml
new file mode 100644
index 0000000000..c97edc1a42
--- /dev/null
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/Fixtures/with_condition.yaml
@@ -0,0 +1,3 @@
+foo:
+    path: /foo
+    condition: '%parameter.condition%'
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/RouterTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/RouterTest.php
index 91d9c4cfd6..ca7ec8bd64 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/RouterTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Routing/RouterTest.php
@@ -14,11 +14,16 @@ namespace Symfony\Bundle\FrameworkBundle\Tests\Routing;
 use PHPUnit\Framework\TestCase;
 use Psr\Container\ContainerInterface;
 use Symfony\Bundle\FrameworkBundle\Routing\Router;
+use Symfony\Component\Config\FileLocator;
 use Symfony\Component\Config\Loader\LoaderInterface;
+use Symfony\Component\Config\ResourceCheckerConfigCache;
+use Symfony\Component\Config\ResourceCheckerConfigCacheFactory;
 use Symfony\Component\DependencyInjection\Config\ContainerParametersResource;
+use Symfony\Component\DependencyInjection\Config\ContainerParametersResourceChecker;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\Routing\Loader\YamlFileLoader;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
 
@@ -503,6 +508,51 @@ class RouterTest extends TestCase
         return [[null], [false], [true], [new \stdClass()], [['foo', 'bar']], [[[]]]];
     }
 
+    /**
+     * @dataProvider getContainerParameterForRoute
+     */
+    public function testCacheValiditiyWithContainerParameters($parameter)
+    {
+        $cacheDir = sys_get_temp_dir().\DIRECTORY_SEPARATOR.uniqid('router_', true);
+
+        try {
+            $container = new Container();
+            $container->set('routing.loader', new YamlFileLoader(new FileLocator(__DIR__.'/Fixtures')));
+
+            $container->setParameter('parameter.condition', $parameter);
+
+            $router = new Router($container, 'with_condition.yaml', [
+                'debug' => true,
+                'cache_dir' => $cacheDir,
+            ]);
+
+            $resourceCheckers = [
+                new ContainerParametersResourceChecker($container),
+            ];
+
+            $router->setConfigCacheFactory(new ResourceCheckerConfigCacheFactory($resourceCheckers));
+
+            $router->getMatcher(); // trigger cache build
+
+            $cache = new ResourceCheckerConfigCache($cacheDir.\DIRECTORY_SEPARATOR.'UrlMatcher.php', $resourceCheckers);
+
+            $this->assertTrue($cache->isFresh());
+        } finally {
+            if (is_dir($cacheDir)) {
+                array_map('unlink', glob($cacheDir.\DIRECTORY_SEPARATOR.'*'));
+                rmdir($cacheDir);
+            }
+        }
+    }
+
+    public function getContainerParameterForRoute()
+    {
+        yield 'String' => ['"foo"'];
+        yield 'Integer' => [0];
+        yield 'Boolean true' => [true];
+        yield 'Boolean false' => [false];
+    }
+
     private function getServiceContainer(RouteCollection $routes): Container
     {
         $loader = $this->createMock(LoaderInterface::class);
diff --git a/src/Symfony/Component/HttpKernel/Tests/KernelTest.php b/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
index 1a57ab94cb..50a6a29b96 100644
--- a/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/KernelTest.php
@@ -17,6 +17,7 @@ use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
+use Symfony\Component\Filesystem\Exception\IOException;
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
@@ -36,8 +37,10 @@ class KernelTest extends TestCase
 {
     protected function tearDown(): void
     {
-        $fs = new Filesystem();
-        $fs->remove(__DIR__.'/Fixtures/var');
+        try {
+            (new Filesystem())->remove(__DIR__.'/Fixtures/var');
+        } catch (IOException $e) {
+        }
     }
 
     public function testConstructor()
@@ -473,7 +476,7 @@ EOF
 
     public function testKernelReset()
     {
-        (new Filesystem())->remove(__DIR__.'/Fixtures/var/cache');
+        $this->tearDown();
 
         $kernel = new CustomProjectDirKernel();
         $kernel->boot();