[Bug]When the client emit the message included symbol '-', the server can't receive this message about socket.io-client-unity3d HOT 8 CLOSED

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using socket.io;

public class Login : MonoBehaviour
{

    Socket io;

    // Use this for initialization
    void Start ()
    {
        io = Socket.Connect ("http://localhost:7001/game");
        io.On ("connect", () => {
            print ("connect event");
            io.Emit ("userJoin", "123456789");
            io.Emit ("userJoin", "mdbj6");
            io.Emit ("userJoin", "a1");
            io.Emit ("userJoin", "1a");
            io.Emit ("userJoin", "987654321");

            io.Emit ("online", "123456789");
            io.Emit ("online", "mdbj6");
            io.Emit ("online", "a1");
            io.Emit ("online", "1a");
            io.Emit ("online", "987654321");
            
            //server side console:
            //userJoin token 123456789
            //userJoin token 987654321
            //online 123456789
            //online 987654321
        });
    }
}

const io = require('socket.io-client');
const socket = io('http://127.0.0.1:7001/game');

socket.on('connect', () => {
  console.log('connect!');
  socket.emit('userJoin', '123456789');
  socket.emit('userJoin', 'mdbj6');
  socket.emit('userJoin', 'a1');
  socket.emit('userJoin', '1a');
  socket.emit('userJoin', '987654321');

  socket.emit('online', '123456789');
  socket.emit('online', 'mdbj6');
  socket.emit('online', 'a1');
  socket.emit('online', '1a');
  socket.emit('online', '987654321');

});
//server side console:
//userJoin token 123456789
//userJoin token mdbj6
//userJoin token a1
//userJoin token 1a
//userJoin token 987654321
//online 123456789
//online mdbj6
//online a1
//online 1a
//online 987654321

exports.userJoin=function*(){
  const msg = this.args[0];
  console.log('userJoin',msg);
}
exports.online=function*(){
  const msg = this.args[0];
  console.log('online',msg);
}

[Serializable]
    public class LoginData
    {
        public string token;
        public string Oh;

        public string ToString ()
        {
            return JsonUtility.ToJson (this);
        }
    }

LoginData data = new LoginData ();
data.token = "1a2b3c";
data.Oh = "data";
io.On ("connect", () => {
    print ("connect event");
    io.Emit ("userJoin", data.ToString ());
    io.Emit ("userJoin", "123456789");
    io.Emit ("userJoin", "mdbj6");
    io.Emit ("userJoin", "a1");
    io.Emit ("userJoin", "1a");
    io.Emit ("userJoin", "987654321");


    io.Emit ("online", "123456789");
    io.Emit ("online", "mdbj6");
    io.Emit ("online", "a1");
    io.Emit ("online", "1a");
    io.Emit ("online", "987654321");
});