Yeah, I just checked the work-in-progress patch I sent you back in July. I refactored it to use one-based offsets for consistency, since I modified log_heap_clean quite heavily anyway.
It's possible that I broke it in the process, I was only interested in testing the performance characteristics of the simplified pruning scheme.
I don't think so -- atleast I couldn't figure out why its broken. But I would take Tom's comment seriously and look more into it tomorrow. Or we can just revert it back to zero-based offsets.
