> If something requires specialized knowledge This seems to be very much the point. I suspect there's actually disagreement about whether the thing actually r

> If something requires specialized knowledge This seems to be very much the point. I suspect there's actually disagreement about whether the thing actually requires specialized knowledge. If there were actually 700 days of February 1295 in the Holy Roman Empire, what are the chances that month would be handled correctly by any layer of my Thursday-counting Saas platform? A lot of times the "specialists" are just as likely to say something like "Dates before 1900 are not supported because they're too hard". And your app probably didn't care about those cases anyway.