Why wouldn't I use it?
My use would be a good place to cache data on a local filesystem. Say you have your database server, and several local machines. Suppose that you have a lot of read-only queries where the backing data does not change often.
Well then, why not cache some of the often hit stuff per webserver and not even bother the database unless you need to? The typing issue is unimportant since all of the data is actually managed elsewhere. Since the entire thing (drivers and all) is in one self-contained module, that makes installation even more convenient than MySQL.
After looking at the documentation for the database, read-only cached data looks like pretty much the only thing I would use it for. The locking is incredibly coarse-grained. However there are cases when it is convenient to have an easily-installed read-only data store.
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