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The specific issue being addressed is macOS 10.15 where the mount point for ~/Library/Application Support is under /System/Volumes/Data so our assertion that the relative path received in our callback can be appended to the mount point, to match the path being observed, is false. As a workaround we call realpath() on the path we wish to observe, observe that path, and in our callback we calculate the relative path from the real observed path, and append that to the requested path. In theory the caller could be made responsible for expanding paths to their real path, but the current abstraction allows observing non-existing paths, which is why it needs to handle this path rewriting.