Msgpack fix 😡

[btoews]

This is apparently expected behavior?

func TestMsgpack(t *testing.T) {
	v := map[uint64]uint64{1: 1}
	b, err := msgpack.Marshal(v)
	assert.NoError(t, err)

	var vv any
	assert.NoError(t, msgpack.Unmarshal(b, &vv))
}

--- FAIL: TestMsgpack (0.00s)
    main_test.go:16: Did not expect an error but got:
        msgpack: invalid code=cf decoding string/bytes length