Doseq is currently a good way to execute a lazy sequence and perform side-effects. It would be nice to have a matching macro for transducers.
Approach: The included patch simply calls transduce with the provided xform, collection, and a reducing function that throws away the accumulated value at each step. The value from each reducing step is bound to the provided symbol. A shorter arity is provided for those cases when no xform is desired, but fast doseq-like semantics are still wanted.