Go语言中如何判断被强制转换为基类型的派生类型的真实类型？

package main

import (
    "fmt"
    "reflect"
)

type T struct{ s string }

func (v *T) WhoAmI() string {
    // reflect.TypeOf(v).Elem().Name() 始终打印 "T"
    fmt.Println(reflect.TypeOf(v).Elem().Name())
    return "T" // 无法区分 T1 和 T2
}

type T1 T

func NewT1(s string) T1 { return T1{s} }

type T2 T

func NewT2(s string) T2 { return T2{s} }

func main() {
    var t1 = T1{"xyz"}
    var t2 = T2{"pdq"}
    s1 := ((*T)(&t1)).WhoAmI() // 期望返回 "T1"
    s2 := ((*T)(&t2)).WhoAmI() // 期望返回 "T2"
    fmt.Println(s1, s2)
}

package main

import "fmt"

type T interface {
    WhoAmI() string
}

type T1 struct {
    s string
}

func (t *T1) WhoAmI() string { return "T1" }

type T2 struct {
    s string
}

func (t *T2) WhoAmI() string { return "T2" }

func main() {
    var t1 T = &T1{"xyz"}
    var t2 T = &T2{"pdq"}
    fmt.Println(t1.WhoAmI(), t2.WhoAmI()) // 输出: T1 T2
}