I think it just forces objects to survive more than one collection before moving out of the nursery, without having a special logic for whether they were rooted

I think it just forces objects to survive more than one collection before moving out of the nursery, without having a special logic for whether they were rooted on the stack or not. But I am not 100% sure so don't quote me on that. https://github.com/lua/lua/blob/6f1c033d72af8fe65bb67e17a242314b6aeb182f/lgc.c#L1133 https://github.com/lua/lua/blob/6f1c033d72af8fe65bb67e17a242...