我正在嘗試為 Go使用Faye 客戶端，但是當我嘗試為客戶端創建接口時，由于回調中的類型，它似乎失敗了：package mainimport (    "fmt"    "github.com/autogrowsystems/wray")type Message interface {    Data() map[string]interface{}}type Promise interface {    Successful() bool}type Subscriber interface {    Subscribe(string, bool, func(Message)) (Promise, error)}func subscribeMe(subber Subscriber) {    subber.Subscribe("/my/chan", false, func(msg Message) {        fmt.Printf("got data: %+v", msg.Data())    })}func main() {    subscribeMe(wray.NewFayeClient("http://localhost/faye"))    fmt.Println("all good!")}此時它失敗并出現以下錯誤：# command-line-argumentsmain/fayetest.go:27: cannot use wray.NewFayeClient("http://localhost/faye") (type *wray.FayeClient) as type Subscriber in argument to subscribeMe:    *wray.FayeClient does not implement Subscriber (wrong type for Subscribe method)            have Subscribe(string, bool, func(wray.Message)) (wray.SubscriptionPromise, error)            want Subscribe(string, bool, func(Message)) (Promise, error)似乎它應該可以工作，因為客戶端確實滿足了接口：// wray.go - wray.FayeClientfunc (self *FayeClient) Subscribe(channel string, force bool, callback func(Message)) (promise SubscriptionPromise, err error) {}// response.go - wray.Message func (self Message) Data() map[string]interface{} {}// wray.go - wray.SubscriptionPromisefunc (self SubscriptionPromise) Successful() bool {}它應該可以正常工作嗎？還是回調搞亂了界面的滿意度？編輯：順便說一句，我是 Faye Client 那個分支的作者，我能做些什么來使它有利于接口？除了放棄回調？