I noticed that there was an update to Big Sur — the newest OS that this machine can run — which I had missed, so I installed it, and the files went away! I als

I noticed that there was an update to Big Sur — the newest OS that this machine can run — which I had missed, so I installed it, and the files went away! I also noticed that there has been issues, like https://github.com/apple/cups/issues/5538 https://github.com/apple/cups/issues/5538, related to spool file clean-up. (The fix to that one leaves some decidedly fishy-looking parentheses, but they were fixed in a later commit.)