static Map putKeysFirst(Map map, O... keys) {
  Map m2 = litorderedmap();
  Map remaining = cloneMap(map);
  for (O key : keys) {
    O value = remaining.get(key);
    if (value != null) {
      m2.put(key, value);
      remaining.remove(key);
    }
  }
  m2.putAll(remaining);
  ret m2;
}