No worries. And to clarify, in context the point is that traversal fundamentally can't be avoided in the case of RAII. This defeats (what I see as) the primary use case of an arena allocator - deallocating an arbitrarily large chunk of contiguous memory in O(1) time regardless of object count.

Of course this is all somewhat tangential to the original topic of generational GCs, where the RAII idiom also has significant negative impacts. The performance characteristics would otherwise be O(n) based on the live set and thus similar to an arena allocator in terms of the ability to dispose of an arbitrarily large number of objects efficiently.