I'm connecting to a server with sftp.UseConcurrentReads(false), then open a file with Client.Open and read it to memory with ioutil.ReadAll. Due to the readAtSequential function (client.go) suppressing io.EOF error, the ioutil.ReadAll can't know when the file is fully read and won't finish.

I'm not sure I understand the reasoning for File.Read() doesn't return io.EOF, it seems like a bug introduced during refactoring. If so, would you accept a PR that fixes it?