Oh yeah the follow up from the meeting was that nobody was bothered by it as long as the interface stayed the same (and of course everyone appreciates a performance bump).
I think Bob’s question is the last thing that needs to be checked and then this is good. So the question is does upping adapt_delta still get rid of divergences in a similar way as it did previously.
Like some people did get mileage out of adapt_delta = 0.99 and 0.95 or whatever. I guess that means find a model where this helped previously and show that it still works. Presumably it will but may as well check.