bug symfony#54851 [Serializer] Fixed "Warning: Attempt to read property "value" on string" (michaljusiega, xabbuh)

This PR was merged into the 7.1 branch.

Discussion
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[Serializer] Fixed "Warning: Attempt to read property "value" on string"

| Q             | A
| ------------- | ---
| Branch?       | 7.1 (7.1.0-BETA1)
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fixed regresion of symfony#53160
| License       | MIT

Hi! I've updated my project to `7.1.0-BETA1` and I found an error.

After update I got: `Warning: Attempt to read property "value" on string` in `vendor/symfony/serializer/Normalizer/AbstractObjectNormalizer.php:748` because in `733 line` the enum-case of value `TypeIdentifier` has been already readed.

![obraz](https://github.com/symfony/symfony/assets/16488888/5227ac76-0fb0-4b00-ab68-2394ab41d7b7)

Quite not sure if tests are possible here.

Commits
-------

90251c9 add test
4b3dcf1 Fixed "Warning: Attempt to read property "value" on string"

Author: xabbuh

src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php

@@ -730,7 +730,7 @@ private function validateAndDenormalize(Type $type, string $currentClass, string
                                 $typeIdentifier = TypeIdentifier::OBJECT;
                                 $class = $t->getClassName();
                             } else {
-                                $typeIdentifier = $t->getTypeIdentifier()->value;
+                                $typeIdentifier = $t->getTypeIdentifier();
                                 $class = null;
                             }
                         }

src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php

@@ -1129,6 +1129,24 @@ public function testNormalizationWithMaxDepthOnStdclassObjectDoesNotThrowWarning
 
         $this->assertSame(['string' => 'yes'], $normalized);
     }
+
+    public function testDenormalizeCollectionOfScalarTypesPropertyWithPhpDocExtractor()
+    {
+        $normalizer = new AbstractObjectNormalizerWithMetadataAndPhpDocExtractor();
+        $data = [
+            'type' => 'foo',
+            'values' => [
+                ['1'],
+                ['2'],
+                ['3'],
+                ['4'],
+                ['5'],
+            ],
+        ];
+        $expected = new ScalarCollectionDocBlockDummy([[1], [2], [3], [4], [5]]);
+
+        $this->assertEquals($expected, $normalizer->denormalize($data, ScalarCollectionDocBlockDummy::class));
+    }
 }
 
 class AbstractObjectNormalizerDummy extends AbstractObjectNormalizer
@@ -1540,3 +1558,50 @@ public function __construct(
     ) {
     }
 }
+
+#[DiscriminatorMap('type', ['foo' => ScalarCollectionDocBlockDummy::class])]
+class ScalarCollectionDocBlockDummy
+{
+    /**
+     * @param array<int, array<int, string>>|null $values
+     */
+    public function __construct(
+        private readonly ?array $values = null,
+    ) {
+    }
+
+    /** @return array<int, array<int, string>>|null */
+    public function getValues(): ?array
+    {
+        return $this->values;
+    }
+}
+
+class AbstractObjectNormalizerWithMetadataAndPhpDocExtractor extends AbstractObjectNormalizer
+{
+    public function __construct()
+    {
+        parent::__construct(new ClassMetadataFactory(new AttributeLoader()), null, new PropertyInfoExtractor([], [new PhpDocExtractor()]));
+    }
+
+    protected function extractAttributes(object $object, ?string $format = null, array $context = []): array
+    {
+        return [];
+    }
+
+    protected function getAttributeValue(object $object, string $attribute, ?string $format = null, array $context = []): mixed
+    {
+        return null;
+    }
+
+    protected function setAttributeValue(object $object, string $attribute, mixed $value, ?string $format = null, array $context = []): void
+    {
+    }
+
+    public function getSupportedTypes(?string $format): array
+    {
+        return [
+            '*' => false,
+        ];
+    }
+}