diff --git a/src/Handler/ContainerHandler.php b/src/Handler/ContainerHandler.php
index 4e498f6..573b4fe 100644
--- a/src/Handler/ContainerHandler.php
+++ b/src/Handler/ContainerHandler.php
@@ -118,7 +118,12 @@ class ContainerHandler implements AfterMethodCallAnalysisInterface, AfterClassLi
             }
 
             if (!$service->isPublic()) {
-                $isTestContainer = $context->parent && ('Symfony\Bundle\FrameworkBundle\Test\KernelTestCase' === $context->parent || is_subclass_of($context->parent, 'Symfony\Bundle\FrameworkBundle\Test\KernelTestCase'));
+                /** @var class-string $kernelTestCaseClass */
+                $kernelTestCaseClass = 'Symfony\Bundle\FrameworkBundle\Test\KernelTestCase';
+                $isTestContainer = $context->parent &&
+                    ($kernelTestCaseClass === $context->parent
+                        || is_subclass_of($context->parent, $kernelTestCaseClass)
+                    );
                 if (!$isTestContainer) {
                     IssueBuffer::accepts(
                         new PrivateService($serviceId, new CodeLocation($statements_source, $expr->args[0]->value)),
diff --git a/src/Stubs/5/Component/HttpFoundation/InputBag.stubphp b/src/Stubs/5/Component/HttpFoundation/InputBag.stubphp
index 28c8968..48a25fa 100644
--- a/src/Stubs/5/Component/HttpFoundation/InputBag.stubphp
+++ b/src/Stubs/5/Component/HttpFoundation/InputBag.stubphp
@@ -2,14 +2,17 @@
 
 namespace Symfony\Component\HttpFoundation;
 
+/**
+ * @template T of string|int|float|bool
+ */
 final class InputBag extends ParameterBag
 {
     /**
      * Returns a string input value by name.
      *
-     * @template D of string|int|float|bool|null
+     * @template D of T|null
      * @psalm-param D $default
-     * @psalm-return string|int|float|bool|D
+     * @psalm-return D|T
      * @psalm-taint-source input
      */
     public function get(string $key, $default = null) {}
diff --git a/src/Stubs/5/Component/HttpFoundation/Request.stubphp b/src/Stubs/5/Component/HttpFoundation/Request.stubphp
index ae16255..edda81c 100644
--- a/src/Stubs/5/Component/HttpFoundation/Request.stubphp
+++ b/src/Stubs/5/Component/HttpFoundation/Request.stubphp
@@ -8,4 +8,14 @@ class Request
      * @psalm-var InputBag
      */
     public $request;
+
+    /**
+     * @psalm-var InputBag<string>
+     */
+    public $query;
+
+    /**
+     * @psalm-var InputBag<string>
+     */
+    public $cookies;
 }
diff --git a/tests/acceptance/acceptance/InputBag.feature b/tests/acceptance/acceptance/InputBag.feature
index 53baf9d..a69feb6 100644
--- a/tests/acceptance/acceptance/InputBag.feature
+++ b/tests/acceptance/acceptance/InputBag.feature
@@ -11,7 +11,24 @@ Feature: InputBag get return type
       use Symfony\Component\HttpFoundation\Request;
       """
 
-  Scenario Outline: Return type is not null if default argument is string.
+  Scenario: Return type is scalar for request property if default argument is string.
+    Given I have the following code
+      """
+      class App
+      {
+        public function __invoke(Request $request): void
+        {
+          $string = $request->request->get('foo', 'bar');
+          trim($string);
+        }
+      }
+      """
+    When I run Psalm
+    Then I see these errors
+      | Type                  | Message                                            |
+      | InvalidScalarArgument | Argument 1 of trim expects string, scalar provided |
+
+  Scenario Outline: Return type is string if default argument is string.
     Given I have the following code
       """
       class App
@@ -24,14 +41,29 @@ Feature: InputBag get return type
       }
       """
     When I run Psalm
-    Then I see these errors
-      | Type                  | Message                                            |
-      | InvalidScalarArgument | Argument 1 of trim expects string, scalar provided |
+    Then I see no errors
     Examples:
       | property |
       | query    |
       | cookies  |
-      | request  |
+
+  Scenario: Return type is nullable for request property if default argument is not provided.
+    Given I have the following code
+      """
+      class App
+      {
+        public function __invoke(Request $request): void
+        {
+          $nullableString = $request->request->get('foo');
+          trim($nullableString);
+        }
+      }
+      """
+    When I run Psalm
+    Then I see these errors
+      | Type                  | Message                                                  |
+      | InvalidScalarArgument | Argument 1 of trim expects string, null\|scalar provided |
+    And I see no other errors
 
   Scenario Outline: Return type is nullable if default argument is not provided.
     Given I have the following code
@@ -47,11 +79,10 @@ Feature: InputBag get return type
       """
     When I run Psalm
     Then I see these errors
-      | Type                  | Message                                                  |
-      | InvalidScalarArgument | Argument 1 of trim expects string, null\|scalar provided |
+      | Type                 | Message                                                         |
+      | PossiblyNullArgument | Argument 1 of trim cannot be null, possibly null value provided |
     And I see no other errors
     Examples:
       | property |
       | query    |
       | cookies  |
-      | request  |