Is it possible to unmarshal JSON into a struct made from reflection without hardcoding the original type?

```golang
package main

import (
  "fmt"
  "encoding/json"
  "reflect"
)

type Employee struct {
  Firstname string     `json:"firstname"`
}

func main() {
  //Original struct
  orig := new(Employee)

  t := reflect.TypeOf(orig)
  v := reflect.New(t.Elem())

  //Reflected struct
  new := v.Elem().Interface().(Employee)

  // Unmarshal to reflected struct
  json.Unmarshal([]byte("{\"firstname\": \"bender\"}"), &new)

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

```

I used a cast to `Employee` in this example. But what if i don't know the type? 

When i just use `v` for the unmarhaling the struct will be zeroed. 

```
json.Unmarshal([]byte("{\"firstname\": \"bender\"}"), v)

```

When I omit the cast I get a map. which is understandable

```
json.Unmarshal([]byte("{\"firstname\": \"bender\"}"), v.Elem().Interface())

```