docs: def default_indexes(
      coords: Mapping[Any, Variable],
      dims: Iterable,
  ) -> 'OrderedDict[Any, pd.Index]':
      """Default indexes for a Dataset/DataArray.
  
      Parameters
      ----------
      coords : Mapping[Any, xarray.Variable]
         Coordinate variables from which to draw default indexes.
      dims : iterable
          Iterable of dimension names.
  
      Returns
      -------
      Mapping from indexing keys (levels/dimension names) to indexes used for
      indexing along that dimension.
      """
      return OrderedDict((key, coords[key].to_index())
                         for key in dims if key in coords)