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Alex Stuart hits a weird error:

Conversion/overflow errors aren’t that unusual – normally a data flow broken by some unexpected data (“no, there’s no chance that field would ever have a character in it”), or perhaps a column hitting max size (“INT will be enough for years, like, 5 years. I’ll have left the company by then”)

But that wasn’t the case here – the package and user tables involved were checked by the dev team and there was no possible overflow. I’d checked system databases for maxed-out identity columns and found nothing. Heads were scratched.

Read on for the post-head-scratch answer.