Caching seems to include the ability to store caches in subfolders, as indicated by the ability to delete caches based on subfolder. But the documentation does not include instruction on how you might do that.
Cache uses dot-notation, like many other classes in Fuel.
In case of the file driver, a cache identifier like "this.that.something" will create a cache file called "something" in the "cache/this/that" directory.
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