readdir is problematic in ways godirwalk works around. Of course one could always just make direct syscalls or use a library that does, but this was a comment

readdir is problematic in ways godirwalk works around. Of course one could always just make direct syscalls or use a library that does, but this was a comment about stdlib. These would likely be implemented differently in hindsight per discussions on the Go project; and there have been discussions about improving them somehow in Go 2(readdir2?).