A full stack, reactive architecture for general purpose programming. Algebraic and monadically composable primitives for concurrency, parallelism, event handling, transactions, multithreading, Web, and distributed computing with complete de-inversion of control (No callbacks, no blocking, pure state)
Using keep causes problems when working interactively in ghci. Very frustrating.
I should be emphasized near the beginning of the tutorial that keep' should be used instead of keep in interactive sessions.