I find the zero safe level needlessly shock oriented.
Many things have no safe value but a low level is less likely to play a major role in a life than another risk.. Cars, guns, opioids, suicide, cancer, maybe the last two have a minor lead influence, mostly outweighed by alcohol.
It's kind of strange that spreadsheet languages don't support money well. Using spreadsheets for escalator style automation is actually quite good and would really be amazing in a language that took typing seriously.