code: function raw(incomingData, logger, opConfig, metadata, slice) {
      const data = _toRecords(incomingData, opConfig.line_delimiter, slice);
      return data.map((record) => {
          try {
              return DataEntity.make(
                  { data: record },
                  metadata
              );
          } catch (err) {
              if (opConfig._dead_letter_action === 'log') {
                  logger.error(err, 'Bad record:', record);
              } else if (opConfig._dead_letter_action === 'throw') {
                  throw err;
              }
              return null;
          }
      });
  }
docs: No parsing, leaving to reader or a downstream op.