A lot of engineers I know rely on arc diff not failing when untracked files are around. Auto-stashing files still requires a change in behavior (for example, unstashing once the diff has gone out).

We have quite a few duplicate rows (a considerable % of our comments apparently from what I can tell). Will the upgrade --apply preserve one comment (and only delete duplicates) or will it delete all copies of a duplicated comment?

In T6995#92300, @epriestley wrote:

What version of Phabricator are you running?

We're running commit SHA 5b3b9b7182ae4a5ce8e34763bb44711792abcb1d