code: public static List<String> get(String name, @Nullable Boolean value) {
      if (value == null) {
        return Collections.emptyList();
      }
      return Arrays.asList("--" + name + "=" + value.toString());
    }
docs: Returns {@code [--name=true]} if value=true, {@code [--name=false]} if value=false, {@code []}
  if value=null.