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From Async/Await to Virtual Threads

A follow-up to how I wish async would work.

For instance, in Trio, which is a Python async library, the decision was made that you have to always have the equivalent of a thread group — they call it a nursery — to spawn an operation. I can imagine various different alternatives for this, such as having a default thread group hang around for background tasks that is implicitly joined when the process is shutting down. There are a lot of questions open about this, particularly in the context of Python, but the idea of no longer having to deal with colored functions really appeals to me and I hope we can explore it a bit.

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