Use AsserEquals for floating-point values

Use AssertEquals for these two specific case will do a better job,
since it'll convert both '0.1' and result of `getContent()` into PHP's
internal representation of floating-point and compares them and it should be fine.
Using `AssertSame` for this tests brings floating-point serialization
into consideration which of course will be php.ini specific.

In order not missing the type assertion point that `AssertSame` does,
we also perform `assertInternalType('string'...`

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src/Symfony/Component/HttpFoundation/Tests/JsonResponseTest.php

@@ -52,7 +52,8 @@ public function testConstructorWithSimpleTypes()
         $this->assertSame('0', $response->getContent());
 
         $response = new JsonResponse(0.1);
-        $this->assertSame('0.1', $response->getContent());
+        $this->assertEquals('0.1', $response->getContent());
+        $this->assertInternalType('string', $response->getContent());
 
         $response = new JsonResponse(true);
         $this->assertSame('true', $response->getContent());
@@ -140,7 +141,8 @@ public function testStaticCreateWithSimpleTypes()
 
         $response = JsonResponse::create(0.1);
         $this->assertInstanceOf('Symfony\Component\HttpFoundation\JsonResponse', $response);
-        $this->assertSame('0.1', $response->getContent());
+        $this->assertEquals('0.1', $response->getContent());
+        $this->assertInternalType('string', $response->getContent());
 
         $response = JsonResponse::create(true);
         $this->assertInstanceOf('Symfony\Component\HttpFoundation\JsonResponse', $response);