Find what data type is behind the any in Go

main.go

package main

import "fmt"

func GetData() any {
	a := map[string]any{
		"name": map[string]any{
			"age": 1,
		},
	}
	return a
}

func main() {
	a := GetData()
	b := a.(map[string]any)
	switch b["name"].(type) {
	case int:
		fmt.Println("int")
	case string:
		fmt.Println("str")
	case map[string]any:
		fmt.Println("map!")
	}
}