code: func NewUnmarshallerAtlased(atl atlas.Atlas) *Unmarshaller {
  	m := new(Unmarshaller)
  	m.unmarshal = cbor.NewUnmarshallerAtlased(cbor.DecodeOptions{CoerceUndefToNull: true}, &m.reader, atl)
  	return m
  }
docs: // NewUnmarshallerAtlased creates a new reusable unmarshaller.