I've added a simple explanation right into the readme: "Essentially, you define your data structures and Baboon generates implementations for you. Then you define new versions, Baboon generates new versions of the structures, the conversions from old structure versions to new ones and forces your to provide conversions which cannot be derived automatically. Also it comes with extremely efficient tagless binary encoding for all your structures."

A data modeling language which derives evolution code automatically, not a general purpose programming language.