static O[] paramsWithout(O[] a1, O... keys) {
  Set set = lithashset(keys);
  new L l;
  for (int i = 0; i+1 < l(a1); i += 2)
    if (!set.contains(a1[i])) {
      l.add(a1[i]);
      l.add(a1[i+1]);
    }
  ret toObjectArray(l);
}