[Form] Fixed: IntegerToLocalizedStringTransformer does not accept "NaN" as valid number anymore

src/Symfony/Component/Form/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformer.php

@@ -35,6 +35,10 @@ class IntegerToLocalizedStringTransformer extends NumberToLocalizedStringTransfo
             return null;
         }
 
+        if ('NaN' === $value) {
+            throw new TransformationFailedException('"NaN" is not a valid integer');
+        }
+
         $formatter = $this->getNumberFormatter();
         $value = $formatter->parse(
             $value,

tests/Symfony/Tests/Component/Form/Extension/Core/DataTransformer/IntegerToLocalizedStringTransformerTest.php

@@ -70,4 +70,24 @@ class IntegerToLocalizedStringTransformerTest extends LocalizedTestCase
 
         $transformer->reverseTransform('foo');
     }
+
+    /**
+     * @expectedException Symfony\Component\Form\Exception\TransformationFailedException
+     */
+    public function testReverseTransformDisallowsNaN()
+    {
+        $transformer = new IntegerToLocalizedStringTransformer();
+
+        $transformer->reverseTransform('NaN');
+    }
+
+    /**
+     * @expectedException Symfony\Component\Form\Exception\TransformationFailedException
+     */
+    public function testReverseTransformDisallowsNaN2()
+    {
+        $transformer = new IntegerToLocalizedStringTransformer();
+
+        $transformer->reverseTransform('nan');
+    }
 }