固定大小的数组包含多个特定类型？

I have an array (coming from JSON) that always contains a string and an int, like so: ["foo",42]

Right now, I have to use []interface{} with assertions arr[0].(string) arr[1].(int)

I'm wondering if there's any way to specify the types expected in the array? I'm picturing something like.. [...]{string,int}

Thanks.

At the first, answer is No. But you can get values from interface{} with type you expected. How about this?

package main

import (
    "encoding/json"
    "fmt"
    "github.com/mattn/go-scan"
    "log"
)

func main() {
    text := `["foo", 42]`

    var v interface{}
    err := json.Unmarshal([]byte(text), &v)
    if err != nil {
        log.Fatal(err)
    }
    var key string
    var val int
    e1, e2 := scan.ScanTree(v, "[0]", &key), scan.ScanTree(v, "[1]", &val)
    if e1 != nil || e2 != nil {
        log.Fatal(e1, e2)
    }
    fmt.Println(key, val)
}