extension Record{
    public static func <(lhs: Self, rhs: Self) -> Bool{
        return lhs.winningPercent() < rhs.winningPercent()
    }

    public static func ==(lhs: Self, rhs: Self) -> Bool{
        return lhs.winningPercent() == rhs.winningPercent()
    }
}

用上一視頻使用的例子，創建了三個遵守Record這個協議的結構體(BaseballRec, BasketballRec, FootballRec)

其三者的實例(baseTeamRec,basketTeamRec,footTeamRec)是可以兩兩互相比較的，也可以調用isPrizable()方法，但當帶入函數topPrizable時

func topPrizable<T: Record & Prizable>(list: [T]) -> T?

topPrizable(list: [baseTeamRec, basketTeamRec, footTeamRec] )

會提示類型不匹配的錯誤，要怎麼修正呢？

Cannot convert value of type '[Any]' to expected argument type '[_]'

且要將這些實例存成Record的Array也有錯誤，提示Record Protocol 要成爲類型得要用泛型約束，gameRecords的類型要如何定義呢？

let gameRecords: [Record] = [baseTeamRec, basketTeamRec, footTeamRec]

Protocol 'Record' can only be used as a generic constraint because it has Self or associated type requirements