code: func FMSketchToProto(s *FMSketch) *tipb.FMSketch {
  	protoSketch := new(tipb.FMSketch)
  	protoSketch.Mask = s.mask
  	for val := range s.hashset {
  		protoSketch.Hashset = append(protoSketch.Hashset, val)
  	}
  	return protoSketch
  }
docs: // FMSketchToProto converts FMSketch to its protobuf representation.