emit 二级map包含中文出错 about go-socket.io HOT 3 CLOSED

package main

import (
    "log"
    "net/http"

    "github.com/googollee/go-socket.io"
)

func main() {
    server, err := socketio.NewServer(nil)
    if err != nil {
        log.Fatal(err)
    }
    server.On("connection", func(so socketio.Socket) {
        log.Println("on connection")
        so.Join("chat")
        so.On("chat message", func(msg string) {
            log.Println("emit:", so.Emit("chat message", msg))
            so.BroadcastTo("chat", "chat message", msg)
        })
        so.On("disconnection", func() {
            log.Println("on disconnect")
        })
        e := so.Emit("test", map[string]interface{}{"abc": map[string]string{"u-a": "中文内容"}})
        log.Print(e)
    })
    server.On("error", func(so socketio.Socket, err error) {
        log.Println("error:", err)
    })

    http.Handle("/socket.io/", server)
    http.Handle("/", http.FileServer(http.Dir("./asset")))
    log.Println("Serving at localhost:5000...")
    log.Fatal(http.ListenAndServe(":5000", nil))
}

package main

import (
    "log"
    "net/http"
    "fmt"
    "github.com/googollee/go-socket.io"
)

func main() {
    log.SetFlags(log.LstdFlags|log.Lshortfile)
    server, err := socketio.NewServer(nil)
    if err != nil {
        log.Fatal(err)
    }
    server.On("connection", func(so socketio.Socket) {
        log.Println("on connection")
        so.Join("chat")
        so.On("chat message", func(msg string) {
            m:=make(map[string]interface{})
            m["a"]="你好"
            e:=so.Emit("cn1111",m)
            //这个没有问题
            fmt.Println("\n\n")

            b:=make(map[string]string)
            b["u-a"]="中文内容"  //这个不能是中文
            m["b-c"]=b
            e=so.Emit("cn2222",m)
            log.Println(e)


            log.Println("emit:", so.Emit("chat message", msg))
            so.BroadcastTo("chat", "chat message", msg)
        })
        so.On("disconnection", func() {
            log.Println("on disconnect")
        })
    })
    server.On("error", func(so socketio.Socket, err error) {
        log.Println("error:", err)
    })

    http.Handle("/socket.io/", server)
    http.Handle("/", http.FileServer(http.Dir("./asset")))
    log.Println("Serving at localhost:5000...")
    log.Fatal(http.ListenAndServe(":5000", nil))
}