Go Maps の「タイプ インターフェイス {} はインデックス作成をサポートしていません」エラーを解決する方法?

package main

import (
    "fmt"
    "reflect"
)

type User struct {
    Name string
}

type Host struct {
    Address string
}

func main() {
    // Create a map with string keys and interface{} values
    map1 := make(map[string]interface{})

    // Populate the map with slices of users and hosts
    map1["users"] = []User{{"Alice"}, {"Bob"}}
    map1["hosts"] = []Host{{"host1"}, {"host2"}}

    // Try to access an element from the "users" slice
    // This will result in an error due to `interface{}` not supporting indexing
    fmt.Println(map1["users"][0]) // type interface {} does not support indexing

    // Explicitly convert the "users" value to a slice of User and index it
    users := map1["users"].([]User)
    fmt.Println(users[0], reflect.TypeOf(users[0])) // {Alice} struct { Name string }
}