Re: VectorWritable subclassing?

[Robin Anil]

On top of that I question whether we need MultiLabelVector and
WeightedVector at all, cant multilabel and instance weight be nullable
fields inside Vector. I dont see a big win (space efficiency) in keeping a
verbose name and separate subclasses just to add 2 fields. A boolean bit can
be kept to see if weight or labels are serialized.