change log

0.1.5.0 - added Control.Varying.Spline

0.2.0.0 - reordered spline type variables for MonadTrans

0.3.0.0 - updated the type of mapOutput to a more friendly, usable signature bug fixes

0.3.1.0 - added stepMany, eitherE

0.4.0.0 - Var and Spline are now parameterized with Identity, removed mix, changed the behavior of race, added untilEvent variants, added tests.