Tracking using the web browser's cache

Mukund writes: "I've written an article and provided a demo about how people can be tracked with a web-browser's cache (instead of cookies). If one were to clear a browser's cookies to remove all tracking information, the cookies can be restored back by a website as if they were not cleared at all. I believe this is a serious issue and more people should know about it, so that they clear the cache as well after clearing cookies."