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I think this post has the best information on it as I am also learning here https://journal.stuffwithstuff.com/2015/02/01/what-color-is-...

It is not just `magic` syntax imo, it is viral to your codebase. The blog post does way more justice than I can explain.

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Yes I understand the function coloring "problem" (oh no functions need to specify in their signature whether they return results immediately or eventually). Regardless, I still don't understand how this prevents green threads a la Project Loom, if you have a function that returns a `CompletableFuture` in Java, it also needs to change its signature.

For what it's worth, there is experimentation of green thread in C# happening.

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