sS hselect(S name, Map map, O... params) {
  ret hselect(map, paramsPlus_skipFirst(params, +name));
}

sS hselect(Map map, O... params) {
  new StringBuilder buf;
  S selected = null;
  if (odd(l(params))) {
    selected = str(first(params));
    params = dropFirst(params);
  }
  int i = indexOf(params, "allowEmpty");
  if (even(i)) {
    buf.append("<option></option>\n");
    params[i] = params[i+1] = null;
  }
  if (nempty(map)) for (O key : keys(map)) {
    O value = map.get(key);
    S k = str(key);
    buf.append(tag("option", htmlencode(str(or(value, ""))),
      value := k,
      selected := eq(selected, k) ? "selected" : null)).append("\n");
  }
  ret tag("select", buf, params) + "\n";
}