bool body_source_cancel_algorithm(JSContext *cx, CallArgs args, HandleObject stream,
                                  HandleObject owner, HandleValue reason) {
  args.rval().setUndefined();
  return true;
}
bool body_source_cancel_algorithm(JSContext *cx, CallArgs args, HandleObject stream,
                                  HandleObject owner, HandleValue reason) {
  args.rval().setUndefined();
  return true;
}