Use a scheduler instead of ForkJoinPool on JVM?

[He-Pin]

Motivation:
As in PR com-lihaoyi/cask@17dbf69 I found it's possible to run the virtual thread on another thread pool instead of the default scheduler.

I think that maybe a little lightweight in some cases if the task never forks.
what do you think, I would like to contribute this if you like.

[natsukagami]

Yes, I think this is definitely useful! Perhaps custom thread pools can be implemented as an instance of Scheduler

[He-Pin]

Great, that's the whole point, I will prepare it after work today:)