lua_tointeger
ref = (int)lua_tointeger(L, -1); /* ref = t[freelist] */
if (lua_tointeger(L, -1) != -0x1234 ||
for (src = s + (size_t)lua_tointeger(L, lua_upvalueindex(3));
if (lua_isnumber(state, -2) && lua_tointeger(state, -2) > 0) {