fix: The function setJSON also accepts objects

system/HTTP/ResponseInterface.php

@@ -210,7 +210,7 @@ public function setContentType(string $mime, string $charset = 'UTF-8');
     /**
      * Converts the $body into JSON and sets the Content Type header.
      *
-     * @param array|string $body
+     * @param array|object|string $body
      *
      * @return $this
      */