for (auto dummy : state) {
    sum = *callable.Call<Integer>(sum, Integer(i));
    i++;
  }
}

// Add numbers in a loop by calling a callable, looking up method every
// time by tokenized string.
void CallFunctionsIndirect(::testing::benchmark::State& state) {
  Integer sum(0);
  Callable callable((impl::TaggedValue(impl::Func(AddTagged))));
  Object o;
  String name("f");
  o.Set(name, callable);
  size_t i = 0;