cakephp/cakephp — pull request #2349 by slywalker (2013-11-18 06:41:58+00:00)
Title: Encode <, >, ', &, and " for RFC4627-compliant JSON, which may also be embedded into HTML.

Those who RFC compliant or not than good?
As shown in the code this
https://github.com/symfony/HttpFoundation/blob/master/JsonResponse.php#L92