Merge branch '6.0' into 6.1

* 6.0:
  do not accept array input when a form is not multiple
  Update PR template

Author: xabbuh

Form.php

@@ -507,7 +507,7 @@ public function submit(mixed $submittedData, bool $clearMissing = true): static
                 $submittedData = null;
                 $this->transformationFailure = new TransformationFailedException('Submitted data was expected to be text or number, file upload given.');
             }
-        } elseif (\is_array($submittedData) && !$this->config->getCompound() && !$this->config->hasOption('multiple')) {
+        } elseif (\is_array($submittedData) && !$this->config->getCompound() && !$this->config->getOption('multiple', false)) {
             $submittedData = null;
             $this->transformationFailure = new TransformationFailedException('Submitted data was expected to be text or number, array given.');
         }

Tests/CompoundFormTest.php

@@ -1057,7 +1057,8 @@ public function testArrayTransformationFailureOnSubmit()
         $this->assertNull($this->form->get('foo')->getData());
         $this->assertSame('Submitted data was expected to be text or number, array given.', $this->form->get('foo')->getTransformationFailure()->getMessage());
 
-        $this->assertSame(['bar'], $this->form->get('bar')->getData());
+        $this->assertNull($this->form->get('bar')->getData());
+        $this->assertSame('Submitted data was expected to be text or number, array given.', $this->form->get('bar')->getTransformationFailure()->getMessage());
     }
 
     public function testFileUpload()

Tests/Extension/Core/Type/ChoiceTypeTest.php

@@ -14,6 +14,7 @@
 use Symfony\Component\Form\ChoiceList\Loader\CallbackChoiceLoader;
 use Symfony\Component\Form\ChoiceList\View\ChoiceGroupView;
 use Symfony\Component\Form\ChoiceList\View\ChoiceView;
+use Symfony\Component\Form\Exception\TransformationFailedException;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\OptionsResolver\Exception\InvalidOptionsException;
 
@@ -1949,7 +1950,12 @@ public function testSubmitInvalidNestedValue($multiple, $expanded, $submissionDa
 
         $form->submit($submissionData);
         $this->assertFalse($form->isSynchronized());
-        $this->assertEquals('All choices submitted must be NULL, strings or ints.', $form->getTransformationFailure()->getMessage());
+        $this->assertInstanceOf(TransformationFailedException::class, $form->getTransformationFailure());
+        if (!$multiple && !$expanded) {
+            $this->assertEquals('Submitted data was expected to be text or number, array given.', $form->getTransformationFailure()->getMessage());
+        } else {
+            $this->assertEquals('All choices submitted must be NULL, strings or ints.', $form->getTransformationFailure()->getMessage());
+        }
     }
 
     public function invalidNestedValueTestMatrix()