symfony
diff --git a/‎src/Symfony/Component/Serializer/Normalizer/ArrayDenormalizer.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Serializer/Normalizer/ArrayDenormalizer.php
+19-2Lines changed: 19 additions & 2 deletions b/‎src/Symfony/Component/Serializer/Normalizer/ArrayDenormalizer.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Serializer/Normalizer/ArrayDenormalizer.php
+19-2Lines changed: 19 additions & 2 deletions
diff --git a/‎src/Symfony/Component/Serializer/Tests/Normalizer/ArrayDenormalizerTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Serializer/Tests/Normalizer/ArrayDenormalizerTest.php
+83Lines changed: 83 additions & 0 deletions b/‎src/Symfony/Component/Serializer/Tests/Normalizer/ArrayDenormalizerTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Serializer/Tests/Normalizer/ArrayDenormalizerTest.php
+83Lines changed: 83 additions & 0 deletions
@@ -29,6 +29,16 @@ class ArrayDenormalizer implements ContextAwareDenormalizerInterface, Denormaliz
 {
     use DenormalizerAwareTrait;
 
+    /**
+     * @var bool
+     */
+    private $checkFirstElement;
+
+    public function __construct(bool $checkFirstElement = false)
+    {
+        $this->checkFirstElement = $checkFirstElement;
+    }
+
     /**
      * {@inheritdoc}
      *
@@ -72,8 +82,15 @@ public function supportsDenormalization($data, string $type, string $format = nu
             throw new BadMethodCallException(sprintf('The nested denormalizer needs to be set to allow "%s()" to be used.', __METHOD__));
         }
 
-        return str_ends_with($type, '[]')
-            && $this->denormalizer->supportsDenormalization($data, substr($type, 0, -2), $format, $context);
+        if (!str_ends_with($type, '[]')) {
+            return false;
+        }
+
+        if ($this->checkFirstElement) {
+            $data = \count($data) === 0 ? null : reset($data);
+        }
+
+        return $this->denormalizer->supportsDenormalization($data, substr($type, 0, -2), $format, $context);
     }
 
     /**
 
@@ -155,6 +155,89 @@ public function testSupportsNoArray()
             )
         );
     }
+
+    public function testSupportsOtherDatatype()
+    {
+        $this->assertFalse(
+            $this->denormalizer->supportsDenormalization(
+                '83fd8e7c-61d4-4318-af88-fb34bd05e31f',
+                __NAMESPACE__.'\Uuid'
+            )
+        );
+
+        $denormalizer2 = new ArrayDenormalizer(true);
+        $denormalizer2->setDenormalizer($this->serializer);
+
+        $this->assertFalse(
+            $denormalizer2->supportsDenormalization(
+                '83fd8e7c-61d4-4318-af88-fb34bd05e31f',
+                __NAMESPACE__.'\Uuid'
+            )
+        );
+    }
+
+    public function testSupportsValidFirstArrayElement()
+    {
+        $denormalizer = new ArrayDenormalizer(true);
+        $denormalizer->setDenormalizer($this->serializer);
+
+        $this->serializer->expects($this->once())
+            ->method('supportsDenormalization')
+            ->with(['foo' => 'one', 'bar' => 'two'], ArrayDummy::class, 'json', [])
+            ->willReturn(true);
+
+        $this->assertTrue(
+            $denormalizer->supportsDenormalization(
+                [
+                    ['foo' => 'one', 'bar' => 'two'],
+                    ['foo' => 'three', 'bar' => 'four'],
+                ],
+                __NAMESPACE__.'\ArrayDummy[]',
+                'json'
+            )
+        );
+    }
+
+    public function testSupportsInValidFirstArrayElement()
+    {
+        $denormalizer = new ArrayDenormalizer(true);
+        $denormalizer->setDenormalizer($this->serializer);
+
+        $this->serializer->expects($this->once())
+            ->method('supportsDenormalization')
+            ->with(['foo' => 'one', 'bar' => 'two'], ArrayDummy::class, 'json', [])
+            ->willReturn(false);
+
+        $this->assertFalse(
+            $denormalizer->supportsDenormalization(
+                [
+                    ['foo' => 'one', 'bar' => 'two'],
+                    ['foo' => 'three', 'bar' => 'four'],
+                ],
+                __NAMESPACE__.'\ArrayDummy[]',
+                'json'
+            )
+        );
+    }
+
+    public function testSupportsNoFirstArrayElement()
+    {
+        $denormalizer = new ArrayDenormalizer(true);
+        $denormalizer->setDenormalizer($this->serializer);
+
+        $this->serializer->expects($this->once())
+            ->method('supportsDenormalization')
+            ->with($this->isNull(), ArrayDummy::class, 'json', [])
+            ->willReturn(true);
+
+        $this->assertTrue(
+            $denormalizer->supportsDenormalization(
+                [],
+                __NAMESPACE__.'\ArrayDummy[]',
+                'json'
+            )
+        );
+    }
 }
 
 class ArrayDummy