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The async-std crate didn't had a release for 1 1/2 years. It also pulls in a lot of dependencies that are usually not needed. The Path::exists() feature of async-std is just using spawn_blocking around the std metadata function and therefore settling on a specific executor and spawning a bunch of threads that might not be needed.
Therefore I replaced all uses of async-std with the crates from which async-std is build and that are well maintained.