Call AssertEquals with proper parameters

Since `$response->getContent()` returns string and our first parameter is already string as well, in some cases (with different precisions) it may "compare strings" as "strings" and this is not what the test wants.
By changing the first parameter to actual number we force `AssertEquals` to compare them numerically rather than literally by string content.

Author: mmokhi

Tests/JsonResponseTest.php

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