If you want to send a proposal, the planned API for rand, similar to what you have sent here, is enough. However, given the proposal is pretty much here already, it is ok to bypass that and send a PR if you prefer.
We don’t plan to have any seed or stateful function. The goal is to use rand/0 and rand/1 as a gateway to the actual :rand module. So we can explicitly document that you can get control over the seed by using the :rand module.
