docs: def run(self, argv=None):
          """
          Run the command-line application.
  
          This will dispatch to the specified function or raise a
          ``SystemExit`` and output the appropriate usage information
          if there is an error parsing the arguments.
  
          The default ``argv`` is equivalent to ``sys.argv[1:]``.
  
          """
          if argv is None:  # pragma: no cover
              argv = sys.argv[1:]
          argv = [str(v) for v in argv]
          meta, args = parse_args(self, argv)
          context_factory = contextmanager(make_generator(self.context_factory))
          with context_factory(self, args, **meta.context_kwargs) as context:
              main = load_main(meta)
              return main(context, args) or 0