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Why isn't there a typeclass for functions?
I got here searching for "undo." My gut feeling is that you can't do better than Category since undo actions only compose and get applied;
Why aren't Object Oriented databases used as much as Relational Databases?
There's probably no single reason, but another one worth mentioning is that relational databases are better integration technology than OODBs are, since all practical OODBs force a particular language and library on you. RDBMSes are much more agnostic and have much better overall data visibility (which includes ad-hoc reporting), partly because the data model you interface with is simpler.