golang fails to parse json for object, created by reflection

test.go

package main

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

type Message struct {
	Data string
}

func main() {
	source := Message{Data: "hello world"}
	fmt.Printf("Source message: %#v\n\n", source) // Source message: main.Message{Data:"hello world"}
	data, err := json.Marshal(source)

	var destination1 Message
	var destination2 Message = reflect.Zero(reflect.TypeOf(Message{})).Interface().(Message)
	var destination3 interface{} = reflect.Zero(reflect.TypeOf(Message{})).Interface()
	
	fmt.Printf("Destination1 value: %#v\n", destination1) // Destination1 value: main.Message{Data:""}
	fmt.Printf("Destination2 value: %#v\n", destination2) // Destination1 value: main.Message{Data:""}
	fmt.Printf("Destination3 value: %#v\n", destination3) // Destination1 value: main.Message{Data:""}
	fmt.Println()
	
	err = json.Unmarshal(data, &destination1)
	err = json.Unmarshal(data, &destination2)
	err = json.Unmarshal(data, &destination3)
	
	fmt.Printf("Destination1: %#v Error: %v\n", destination1, err) // Destination1: main.Message{Data:"hello world"} Error: <nil>
	fmt.Printf("Destination2: %#v Error: %v\n", destination2, err) // Destination2: main.Message{Data:"hello world"} Error: <nil>
	fmt.Printf("Destination3: %#v Error: %v\n", destination3, err) // Destination3: map[string]interface {}{"Data":"hello world"} Error: <nil>
}

In first two cases unmarshal returns Message, but in the third case unmarshal returns map[string]interface instead of Message

http://play.golang.org/p/QEyDN9vztr