Shell prints input line when run with NewWithConfig on different terminal

ishell.go の NewWithConfig 関数と、readline.Config との連携方法を調べてください。この問題は、StdinWriter フィールドによって二重にエコーされることが原因である可能性があります。カスタムターミナルで設定した場合に readline ライブラリが入力/出力ストリームをどのように処理するかを調べてください。config を変更して netcat 経由で接続し、重複が停止するか確認してテストしてください。

Apols if I'm making a mistake here and this is not a bug - I would like to be able to access ishell through another terminal instance on Linux with go 1.12.5. So first, I set up a listener (leaving out error handling and defer here to keep the code short):

 listener, err := net.Listen("tcp", host)
 conn, err := listener.Accept()

where host is "localhost:8000" for testing. Next, I've imported "github.com/abiosoft/readline" to be able to run the shell with the listener's connection parameters in the configuration for NewWithConfig:

termCfg := &readline.Config{
        Stdin:       io.ReadCloser(conn),
        Stdout:      io.Writer(conn),
        StdinWriter: io.Writer(conn),
        Stderr:      io.Writer(conn),
}

Then I start the shell in a second terminal window through the listener:

shell := ishell.NewWithConfig(termCfg)
shell.Run()

This works fine when I open another shell and connect with nc localhost 8000 - except for the fact that after I type in a command such as help, the input line is not only echoed character for character as expected, but then printed again, giving me stuff like

> help
> help

Commands:
  clear        clear the screen
  exit         exit the program
  help         display help

I'm wondering if StdinWriter is the problem here, but changing that doesn't seem to help. I can't find an example for NewWithConfig in the docs. Is this a bug or am I missing something obvious? Thanks!