Function luabb_isnull

lua/ltypes.c:2161–2169

}

int luabb_isnull(lua_State *lua, int arg_index)
{
    int type = lua_type(lua, arg_index);
    if (type == LUA_TUSERDATA) {
        const lua_dbtypes_t *n = lua_topointer(lua, arg_index);
        return n->is_null;
    }
    return 0;
}

int luabb_istyped(lua_State *lua, int arg_index)
{