code: func (s *LogStream) DescriptorValue() (*logpb.LogStreamDescriptor, error) {
  	pb := logpb.LogStreamDescriptor{}
  	if err := proto.Unmarshal(s.Descriptor, &pb); err != nil {
  		return nil, err
  	}
  	return &pb, nil
  }
docs: // DescriptorValue returns the unmarshalled Descriptor field protobuf.