How to convert cty.Value of unknown type into `interface{}` about go-cty HOT 2 CLOSED

package main

import (
	"fmt"
	"github.com/zclconf/go-cty/cty"
	"github.com/zclconf/go-cty/cty/json"
)

func convertToInterface(val cty.Value) interface{} {
	switch val.Type() {
	case cty.String:
		return val.AsString()
	case cty.Bool:
		return val.True()
	case cty.Number:
		return val.AsBigFloat().String()
	case cty.Object:
		obj := make(map[string]interface{})
		val.ForEach(func(key cty.Value, value cty.Value) bool {
			obj[key.AsString()] = convertToInterface(value)
			return true
		})
		return obj
	case cty.List:
		list := make([]interface{}, 0)
		val.ForEachElement(func(index int, value cty.Value) bool {
			list = append(list, convertToInterface(value))
			return true
		})
		return list
	default:
		return nil
	}
}

func main() {
	hcl := `{
		"foo": "foostring",
		"bar": true,
		"buzz": [1, 2, 3]
	}`

	val, err := json.Unmarshal([]byte(hcl), cty.DynamicPseudoType)
	if err != nil {
		fmt.Println(err)
		return
	}

	result := convertToInterface(val)

	fmt.Printf("%+v\n", result)
}