So the Async gem allows the programmer to fire "tasks" and wait for them to finish (the same way we can fire threads), but instead of OS-level threads (which is what MRI uses for Threads) it uses a new kind of Fibers, called "non-blocking Fibers", that are lightweight and don't use OS threads, like normal Fibers, but unlike normal Fibers they yield automatically to the scheduler when blocked (sort of like threads).

Is this a correct-ish way to describe the current state of affairs?