diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index f554d85..5d63dbb 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -19,6 +19,15 @@ parameters:
         - src/Configuration.php
         - src/Mapping/Annotation/Router.php
         - src/Route/RouteResolver.php
+    # Slim's invokation strategy
+    - message: '/^Parameter #1 \$callable \(callable\(Psr\\Http\\Message\\ServerRequestInterface\): mixed\) of method Jgut\\Slim\\Routing\\Strategy\\RequestHandler::__invoke\(\) should be contravariant with parameter \$callable \(callable\(\): mixed\) of method Slim\\Interfaces\\InvocationStrategyInterface::__invoke\(\)$/'
+      path: src/Strategy/RequestHandler.php
+    - message: '/^Parameter #1 \$callable \(callable\(Psr\\Http\\Message\\ServerRequestInterface, Psr\\Http\\Message\\ResponseInterface, array<string, mixed>\): mixed\) of method Jgut\\Slim\\Routing\\Strategy\\RequestResponse::__invoke\(\) should be contravariant with parameter \$callable \(callable\(\): mixed\) of method Slim\\Interfaces\\InvocationStrategyInterface::__invoke\(\)$/'
+      path: src/Strategy/RequestResponse.php
+    - message: '/^Parameter #1 \$callable \(callable\(Psr\\Http\\Message\\ServerRequestInterface, Psr\\Http\\Message\\ResponseInterface\): mixed\) of method Jgut\\Slim\\Routing\\Strategy\\RequestResponseArgs::__invoke\(\) should be contravariant with parameter \$callable \(callable\(\): mixed\) of method Slim\\Interfaces\\InvocationStrategyInterface::__invoke\(\)$/'
+      path: src/Strategy/RequestResponseArgs.php
+    - message: '/^Parameter #1 \$callable \(callable\(Psr\\Http\\Message\\ServerRequestInterface, Psr\\Http\\Message\\ResponseInterface\): mixed\) of method Jgut\\Slim\\Routing\\Strategy\\RequestResponseNamedArgs::__invoke\(\) should be contravariant with parameter \$callable \(callable\(\): mixed\) of method Slim\\Interfaces\\InvocationStrategyInterface::__invoke\(\)$/'
+      path: src/Strategy/RequestResponseNamedArgs.php
     # Slim's route
     - message: '/^Parameter #3 \$callable of method Slim\\Routing\\Route::__construct\(\) expects \(callable\(\): mixed\)\|string, array{string, string}\|\(callable\(\): mixed\)\|string given\.$/'
       path: src/Route/Route.php
diff --git a/src/Console/AbstractRoutingCommand.php b/src/Console/AbstractRoutingCommand.php
index 3dec637..a02b90a 100644
--- a/src/Console/AbstractRoutingCommand.php
+++ b/src/Console/AbstractRoutingCommand.php
@@ -26,7 +26,7 @@ abstract class AbstractRoutingCommand extends Command
      */
     final protected function getTableRows(array $routes): array
     {
-        return array_values(array_map(
+        return array_map(
             static function (RouteInterface $route): array {
                 $xmlHttpRequest = false;
                 if ($route instanceof Route) {
@@ -50,6 +50,6 @@ static function (RouteInterface $route): array {
                 ];
             },
             $routes,
-        ));
+        );
     }
 }
diff --git a/src/Mapping/Driver/AnnotationDriver.php b/src/Mapping/Driver/AnnotationDriver.php
index aeaa1ed..c725c71 100644
--- a/src/Mapping/Driver/AnnotationDriver.php
+++ b/src/Mapping/Driver/AnnotationDriver.php
@@ -42,7 +42,7 @@ public function getMetadata(): array
             $routes[] = $this->getRoutesMetadata($class, $groups);
         }
 
-        return \count($routes) > 0 ? array_values(array_merge(...$routes)) : [];
+        return \count($routes) > 0 ? array_merge(...$routes) : [];
     }
 
     /**
diff --git a/src/Mapping/Driver/AttributeDriver.php b/src/Mapping/Driver/AttributeDriver.php
index d38239c..221257c 100644
--- a/src/Mapping/Driver/AttributeDriver.php
+++ b/src/Mapping/Driver/AttributeDriver.php
@@ -47,7 +47,7 @@ public function getMetadata(): array
             $routes[] = $this->getRoutesMetadata($class, $groups);
         }
 
-        return \count($routes) > 0 ? array_values(array_merge(...$routes)) : [];
+        return \count($routes) > 0 ? array_merge(...$routes) : [];
     }
 
     /**
@@ -245,7 +245,7 @@ private function populateTransformer(
         }
 
         $metadata->setParameters($parameters);
-        $metadata->setTransformers(array_values($transformers));
+        $metadata->setTransformers($transformers);
     }
 
     /**
diff --git a/src/Mapping/Driver/FileMappingTrait.php b/src/Mapping/Driver/FileMappingTrait.php
index 69181ae..e0e6664 100644
--- a/src/Mapping/Driver/FileMappingTrait.php
+++ b/src/Mapping/Driver/FileMappingTrait.php
@@ -70,7 +70,7 @@ protected function getRoutesMetadata(array $mappingData, ?GroupMetadata $group =
             }
         }
 
-        return \count($routes) > 0 ? array_values(array_merge(...$routes)) : [];
+        return \count($routes) > 0 ? array_merge(...$routes) : [];
     }
 
     /**
diff --git a/src/Route/RouteResolver.php b/src/Route/RouteResolver.php
index 8f9303d..3a11f59 100644
--- a/src/Route/RouteResolver.php
+++ b/src/Route/RouteResolver.php
@@ -51,7 +51,7 @@ public function getMiddleware(RouteMetadata $route): array
         ));
         array_unshift($middleware, $route->getMiddlewares());
 
-        return array_values(array_merge(...$middleware));
+        return array_merge(...$middleware);
     }
 
     /**
@@ -249,9 +249,9 @@ static function (array $itemA, array $itemB) use ($sortFunction): int {
             },
         );
 
-        return array_values(array_map(
+        return array_map(
             static fn(array $item): RouteMetadata => $item[1],
             $sortArray,
-        ));
+        );
     }
 }