[Form] NumberToLocalizedStringTransformer should return floats when possible

Author: nicolas-grekas

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

@@ -140,6 +140,10 @@ public function reverseTransform($value)
             throw new TransformationFailedException('I don\'t have a clear idea what infinity looks like');
         }
 
+        if (is_int($result) && $result === (int) $float = (float) $result) {
+            $result = $float;
+        }
+
         if (function_exists('mb_detect_encoding') && false !== $encoding = mb_detect_encoding($value, null, true)) {
             $length = mb_strlen($value, $encoding);
             $remainder = mb_substr($value, $position, $length, $encoding);

src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php

@@ -434,10 +434,17 @@ public function testReverseTransformDisallowsTrailingExtraCharactersMultibyte()
         $transformer->reverseTransform("12\xc2\xa0345,678foo");
     }
 
-    public function testReverseTransformBigint()
+    public function testReverseTransformBigInt()
     {
         $transformer = new NumberToLocalizedStringTransformer(null, true);
 
         $this->assertEquals(PHP_INT_MAX - 1, (int) $transformer->reverseTransform((string) (PHP_INT_MAX - 1)));
     }
+
+    public function testReverseTransformSmallInt()
+    {
+        $transformer = new NumberToLocalizedStringTransformer(null, true);
+
+        $this->assertSame(1.0, $transformer->reverseTransform('1'));
+    }
 }