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ちゃんと話終えてないかもしれないですが、この辺の話ですか? https://github.com/apple/swift/blob/068291cba7199051bcd9e19aa3c1268a3c6b1e4a/stdlib/public/Concurrency/GlobalExecutor.cpp#L319-L328
5:26 AM
We cannot safely elevate the priorities of work added to this queue using Dispatch's public API, but as discussed above, that is less important than avoiding performance problems.