Confused.
https://www.codeigniter.com/user_guide/general/caching.html
says caches are created in application/cache.
But, in the system config.php it says the default cache is in system/cache/.
/*
|--------------------------------------------------------------------------
| Cache Directory Path
|--------------------------------------------------------------------------
|
| Leave this BLANK unless you would like to set something other than the default
| system/cache/ folder. Use a full server path with trailing slash.
|
*/
Which, if any, does CI use?
application/cache is correct. It was changed to application/cache from system/cache in 2.0.0 according to the change log. The comments just weren't updated.