coroutine-frp is an experimental package that builds an AFRP interface on top of coroutines.
This package deviates a lot from "classical" FRP in that it is meant exclusively for fixed time-step simulations and as such there is no concept of continous time. Whereas classical FRP abstracts behaviours as functions of time -> value and events as a stream of (time, event) values, coroutine-frp models values that change over time as coroutines which are called once per each time-step. Events are modeled as coroutines which return a list of events that occur during the current time-step.
This package is currently in a very early design phase and all interfaces are in flux.