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And, when will we define some specified FileSystem exception types? It's important to who want to know what's happened in the underlying OS. And some internal operation also need it. Some methods like `deleteIfExists` shouldn't be implemented as check existent and then do deletion. Try to delete it and catch the `NoSuchFileException` is a better choice.
Even the FileSystemException tree definition designed by the Java is not clearly enough(At least to me that's true.), a new design is better than no.
I create an issue on the GitHub, shall we talk it on the GitHub? I saw currently there's on place to discuss the API design. <https://github.com/Kotlin/kotlinx-io/issues/472|https://github.com/Kotlin/kotlinx-io/issues/472>
At least there's no link to the slack channel so I don't know we have a heated discussion here.