参数类型“Player Function(Player)”不能分配给参数类型“Player Function(User)”

class Player {
    name: string;
    constructor(name: string) {
        this.name = name;
    }
}

class User {
    username: string;
    constructor(username: string) {
        this.username = username;
    }
}

function process<T>(fn: (item: T) => void, item: T) {
    fn(item);
}

function handlePlayer(player: Player) {
    console.log(player.name);
}

const user = new User("Alice");
process(handlePlayer, user); // 错误：类型不兼容

process(handlePlayer as (item: User) => void, user);

interface Identifiable {
    id: string;
}

class Player implements Identifiable {
    name: string;
    id: string;
    constructor(name: string, id: string) {
        this.name = name;
        this.id = id;
    }
}

class User implements Identifiable {
    username: string;
    id: string;
    constructor(username: string, id: string) {
        this.username = username;
        this.id = id;
    }
}

function handleIdentifiable(identifiable: Identifiable) {
    console.log(identifiable.id);
}

process(handleIdentifiable, user); // 正确