func (s Versions) Versions() C.UInt64List { return C.UInt64List(C.Struct(s).GetObject(1)) }
func (s PostingList) Ids() C.UInt64List { return C.UInt64List(C.Struct(s).GetObject(0)) }
func (s VectorClock) Values() C.UInt64List { return C.UInt64List(C.Struct(s).GetObject(1)) }
func (s Z) U64vec() C.UInt64List { return C.UInt64List(C.Struct(s).GetObject(0)) }