[[!comment format=mdwn username="spwhitton" subject="comment 6" date="2015-12-02T04:57:57Z" content=""" Seems I blanked on your `changesFile` combinator when I sat down to write mine. Taking a look now, my approach is much more direct for cases like `Apt.buildDep` when the problem is registering a change when there should be NoChange, whereas I think the intention of your changesFile is the opposite case. Though it might be nice to combine them. Let me know what you think. """]]