clientv3/compare.go
func (cmp *Cmp) ValueBytes() []byte {
	if tu, ok := cmp.TargetUnion.(*pb.Compare_Value); ok {
		return tu.Value
	}
	return nil
}
func (cmp *Cmp) ValueBytes() []byte {
	if tu, ok := cmp.TargetUnion.(*pb.Compare_Value); ok {
		return tu.Value
	}
	return nil
}
// ValueBytes returns the byte slice holding the comparison value, if any.