public static boolean bool(Object tag) {
    return !(tag == null || booleanFalseValues.contains(tag.toString()));
  }
Returns {@code false} if {@code tag} is empty, "0", "false", or "no" and {@code true} otherwise.
planetiler-core/src/main/java/com/onthegomap/planetiler/util/Imposm3Parsers.java