docs: def _get_header(self):
          """Get the header from the deinfed header rows, for use  on references or resources where the schema
          has not been run"""
  
          try:
              header_lines = [int(e) for e in str(self.get_value('headerlines', 0)).split(',')]
          except ValueError as e:
              header_lines = [0]
  
          # We're processing the raw datafile, with no schema.
          header_rows = islice(self.row_generator, min(header_lines), max(header_lines) + 1)
  
          from tableintuit import RowIntuiter
          headers = RowIntuiter.coalesce_headers(header_rows)
  
          return headers