[ghostwriter]

GHC Haskell's runtime has a "default" light-weight thread system (forkIO) that schedules logical threads on the available operating system threads and parallelises them across available CPUs:

- https://wiki.haskell.org/Parallelism#Multicore_GHC

- https://stackoverflow.com/a/41485705

- https://www.aosabook.org/en/posa/warp.html