docs: def _handle_extend(self, state, sls, saltenv, errors):
          '''
          Take the extend dec out of state and apply to the highstate global
          dec
          '''
          if 'extend' in state:
              ext = state.pop('extend')
              if not isinstance(ext, dict):
                  errors.append(('Extension value in SLS \'{0}\' is not a '
                                 'dictionary').format(sls))
                  return
              for name in ext:
                  if not isinstance(ext[name], dict):
                      errors.append(('Extension name \'{0}\' in SLS \'{1}\' is '
                                     'not a dictionary'
                                     .format(name, sls)))
                      continue
                  if '__sls__' not in ext[name]:
                      ext[name]['__sls__'] = sls
                  if '__env__' not in ext[name]:
                      ext[name]['__env__'] = saltenv
                  for key in list(ext[name]):
                      if key.startswith('_'):
                          continue
                      if not isinstance(ext[name][key], list):
                          continue
                      if '.' in key:
                          comps = key.split('.')
                          ext[name][comps[0]] = ext[name].pop(key)
                          ext[name][comps[0]].append(comps[1])
              state.setdefault('__extend__', []).append(ext)