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Async features in almost all popular languages are a single thread running an event loop (Go being an exception there I believe). Multi threading is still quite difficult to get right if the task isn’t trivially parallelizable.
A lot of languages have an asunc/await facade for tasks run on a background thread for result (c#, clj, py, etc), but it’s certainly not the default anywhere, and go most goroutines(?)/other csp implementations are probably going to be yielding for some io most of the time at the bottom anyway
Yes I’m mostly familiar with this in Kotlin. Sometimes this is kinda a footgun because you’re writing multi threaded code without explicitly doing so.