used items.
This stops swap being used on sites where not all the resources will fit in
memory, but ensures that frequently used resources like templates stay in the
cache. This drastically improves performance in such cases.
This prevents file/directory clashes. Example:
when we have a `tags` item, and a `tags/foo` item,
there will be a clash since the store creates:
- a file `store/tags`;
- a file `store/tags/foo`.
The second file requires the first file to be a
directory.
We simply solve this by adding a suffix to all
store files, so it becomes:
- a file `store/tags.hakyllstore`;
- a file `store/tags/foo.hakyllstore`.
