static Map addParamsToMap_inPlace(Map map, O... params) {
  if (map == null) null;
  int n = l(params);
  if (l(params) == 1 && params[0] instanceof Map)
    putAll(map, (Map) params[0]);
  else
    for (int i = 0; i+1 < n; i += 2)
      mapPut(map, params[i], params[i+1]);
  ret map;
}

Began life as a copy of #1009709