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This is cool. So basically you create a group of threads and you can treat them as one unit. Trio does something similar (structured concurrency) with async functions for Python. Are these OS threads or green threads?

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They can be OS threads or green threads, you can choose.

Are OS threads still the default and you have to pass a virtual thread executor to use virtual threads?

When you deploy a flow, you choose the workload type (:compute, :io, or :mixed) and the process will be deployed with the appropriate thread type.

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