// pairs of (result, module id)
static L<Pair<O, S>> dm_universalSearch(S query) {
  new L<Pair<O, S>> out;
  for (O m : dm_listModules()) pcall {
    L result = cast callOpt(m, 'uSearch, query);
    if (nempty(result)) {
      S id = dm_moduleID(m);
      for (O s : takeFirst(3, result))
        out.add(pair(s, id));
    }
  }
  ret out;
}