docs: def save_cache(dpath, fname, cfgstr, data, ext='.cPkl', verbose=None):
      """
      Saves data using util_io, but smartly constructs a filename
      """
      fpath = _args2_fpath(dpath, fname, cfgstr, ext)
      util_io.save_data(fpath, data, verbose=verbose)
      return fpath