> when effects are mature (when lwt and async are snuffed out). That's actually on the way right now. The main concurrency library which is designed for OCaml

> when effects are mature (when lwt and async are snuffed out). That's actually on the way right now. The main concurrency library which is designed for OCaml 5, eio, internally uses effects but doesn't require its users to be exposed to them. Users write code in direct style and don't need to care about internal implementation with effects.