When should I use onFork?

[David Alayachew]

Hello @loom-dev <loom-dev at openjdk.org>,

I've been enjoying the Structured Concurrency API lately, and made many
many custom joiners to meet my needs -- over 40 of them!

However, of all those Joiners I made, not a single one made use of the
onFork() method. I never could find a way to use it in a way that
onComplete() wouldn't cover.

Can I get some context on it? What is it meant for? And maybe an example of
where it is useful in a way that can't easily be done via onComplete()?

Thank you for your time and help.
David Alayachew
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