[][2]string unmarshaling does not work

[client9]

create directory junk and enter it

mkdir junk
cd junk

create this file pairs.go

package junk

type Pairs struct {
    Name string
    KeyValues [][2]string
}

run this

codecgen -o pairs_ugoriji.go pairs.go

or

codecgen -u -o pairs_ugoriji.go pairs.go

Write a test

package junk

import (
    "reflect"
    "testing"
    "github.com/ugorji/go/codec"
)

func TestJunk(t *testing.T) {
    obj := Pairs{
        Name: "whatev",
        KeyValues: [][2]string{
            {"key1", "value1"},
            {"key2", "value2"},
        },
    }

    raw := []byte{}
    mh := codec.MsgpackHandle{}
    enc := codec.NewEncoderBytes(&raw, &mh)
    err := enc.Encode(obj)
    if err != nil {
        t.Fatalf("Failed to Marshal via Ugorji: %s", err)
    }

    // test 3 Ugorji Ugorji
    mh = codec.MsgpackHandle{}
    dec := codec.NewDecoderBytes(raw, &mh)
    obj2 := Pairs{}
    err = dec.Decode(&obj2)
    if err != nil {
        t.Fatalf("Failed to unmarshal Ugorji via Ugorji: %s", err)
    }
    if !reflect.DeepEqual(obj, obj2) {
        t.Errorf("got\n %#v\n vs\n%#v", obj, obj2)
    }
}

Run tests

go test -v ./...

I get this

$ go test -v ./...
=== RUN   TestJunk
--- FAIL: TestJunk (0.00s)
    pairs_test.go:36: got
         junk.Pairs{Name:"whatev", KeyValues:[][2]string{[2]string{"key1", "value1"}, [2]string{"key2", "value2"}}}
         vs
        junk.Pairs{Name:"whatev", KeyValues:[][2]string{[2]string{"", ""}, [2]string{"", ""}}}
FAIL