code: def to_rec_single(samples, default_keys=None):
      
      out = []
      for data in samples:
          recs = samples_to_records([normalize_missing(utils.to_single_data(data))], default_keys)
          assert len(recs) == 1
          out.append(recs[0])
      return out
docs: Convert output into a list of single CWL records.