Clojure tracks and rollbacks the STM-bound variables according the STM rules; it is not intended to prevent you from doing other effects inside those transactio

Clojure tracks and rollbacks the STM-bound variables according the STM rules; it is not intended to prevent you from doing other effects inside those transactions; you are supposed to have an understanding not to do that in the transaction blocks. It helps a bit that most clojure datastructures are immutable/persistant by default.