Efficient relational queries on Haskell sets. Just pick which parts of your data structures you want indexed using an easy to use template-haskell function. Spare yourself the need to write, run, and maintain code that marshalls your data to/from an external relational database just for efficient queries. IxSet relies on generics and TH to spare you the boilerplate normally required for such tasks. Module consolidation from other packages. Tested with AllIn and new state stuff.