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

static Map putKeysFirst(L keys, Map map) {
  ret putKeysFirst(map, toObjectArray(keys));
}