Should have an index of dates, for determining progress based on how many tabs are present even when jumping to a specific tab group (based on how many are present before a certain time).
Also, maybe do the reduction with an object rather than a number, tracking the number of, say, stash tabs vs. snapshot tabs (as well as the total, of course).
Should have an index of dates, for determining progress based on how many tabs are present even when jumping to a specific tab group (based on how many are present before a certain time).