Nah, no biggie: I had a table with 468 autonumbered entries (as well as 468 almost unique text fields as a double-check). I simply reconfigured each field from formula to single-select and paged through the new drop-down list to see if anything was missed.
My first attempt was inconclusive, as the text field I chose was only nearly unique, and Airtable dutifully combined like values. I next tried it with the autonumbered field — and then sorted the select options alphabetically, as I’d forgotten I’d reordered the records. Paging through those, i was able to eyeball they were all there.
(Incidentally, this was the same base where I had discovered there is a limit to the number of branches in a formula: Seemingly, the hard limit is, um, 353, which maps into no memory model of which I’m aware. As a result, an IF() statement with 353 IF() clauses works fine — but if you add a 354th, the field simply reports #ERROR. Initially i thought this was because of a 32,768-character limit on the size of the formula itself, but I was later able to create formulas longer than 34,000 characters that worked and far shorter, 354-branch formulas that failed.)
