lua_pushnil(state);
while (lua_next(state, LUA_GLOBALSINDEX) != 0)
{
  dump_stack(state, "start...");
  if (lua_type(state, -2) == LUA_TSTRING)
  {
    const char* k = lua_tostring(state, -2);
    printf("unloading %s\n", k);
    dump_stack(state, "after get key...")
    SharedValue newValue = LuaUtils::ToKrollValue(state);  // pops value and converts
    dump_stack(state, "after get value...");
    SharedValue existingValue = window_global->Get(k);
    if (!newValue->Equals(existingValue))
    {
      window_global->Set(k, newValue);
    }
  }
  else
  {
    lua_pop(state, 1);
  }
  dump_stack(state, "end");
}