[Feature] Logged in user cache

Hi Taylor,

First of, major props for this lightweight and very clear cache solution.
I am really liking it combined with Autoptimize I must say (I have been using WP Rocket for … well a long time but it became a hassle to get good speeds with it every now and again).

I was wondering what your thoughts might be on enabling / offering logged in user cache.
Just now I spotted the code in /simple-cache/inc/dropins/file-based-page-cache.php where you check if a user is logged in.

And while I get that, this does make the caching useless for sites with multiple user groups (as in normal users and more elevated ones) Having an option to use this would be wonderful. You could then offer user specific cache.

You could use a similar approach as Wp-Rocket;
/cache/simple-cache/www.domain.com
/cache/simple-cache/www.domain.com_[nice_username]

Is that something you might consider implementing?

Kind regards,
Patrick Dankers