I wrote this practical article

I wrote this practical article around a reproducible four-record example. It shows why a correct multi-tag split can produce five output rows, how matching totals can still hide a dropped record, and why text IDs and multiline fields need preservation checks. The Python implementation and synthetic fixtures are public.

Read the article: https://github.com/sjdoane/csv-tag-splitter/blob/main/articles/why-four-csv-rows-become-five.md