Revert "fix: add flag to force object (#416)"

This reverts commit e67638d.

Author: bshaffer

src/JWT.php

@@ -355,7 +355,7 @@ public static function jsonDecode(string $input)
     public static function jsonEncode(array $input): string
     {
         if (PHP_VERSION_ID >= 50400) {
-            $json = \json_encode($input, \JSON_UNESCAPED_SLASHES|\JSON_FORCE_OBJECT);
+            $json = \json_encode($input, \JSON_UNESCAPED_SLASHES);
         } else {
             // PHP 5.3 only
             $json = \json_encode($input);

tests/JWTTest.php

@@ -321,15 +321,6 @@ public function testRSEncodeDecodeWithPassphrase()
         $this->assertEquals($decoded, $expected);
     }
 
-    public function testDecodesEmptyArrayAsObject()
-    {
-        $key = 'yma6Hq4XQegCVND8ef23OYgxSrC3IKqk';
-        $payload = [];
-        $jwt = JWT::encode($payload, $key, 'HS256');
-        $decoded = JWT::decode($jwt, new Key($key, 'HS256'));
-        $this->assertEquals((object) $payload, $decoded);
-    }
-
     /**
      * @runInSeparateProcess
      * @dataProvider provideEncodeDecode