docs: def records(self):
          """
          Yield BLAST records, as read by the BioPython NCBIXML.parse
          method. Set self.params from data in the first record.
          """
          first = True
          with as_handle(self._filename) as fp:
              for record in NCBIXML.parse(fp):
                  if first:
                      self.params = self._convertBlastParamsToDict(record)
                      first = False
                  yield record