docs: def merge_coords_for_inplace_math(objs, priority_vars=None):
      """Merge coordinate variables without worrying about alignment.
  
      This function is used for merging variables in coordinates.py.
      """
      expanded = expand_variable_dicts(objs)
      variables = merge_variables(expanded, priority_vars)
      assert_unique_multiindex_level_names(variables)
      return variables