I guess you could place a zeroing allocator wrapper in between the arena and it's underlying allocator. That would write zero to anything that's getting freed.

I guess you could place a zeroing allocator wrapper in between the arena and it's underlying allocator. That would write zero to anything that's getting freed. Arena deinit will free anything allocated from the underlying allocator so upon completion of each request, used memory would be zeroed before returned back to the main allocator. And that handler signature would still be the same. Which is the he whole point of this article so, yay.