Parsing the Infamous Japanese Postal CSV

previous discussion in 2020 https://news.ycombinator.com/item?id=25023673

This 2025 discussion links to this too https://news.ycombinator.com/item?id=44117779

There is a still flawed but less insane “utf_ken_all.csv” published as of 2023 and there is an API with even less legacy weirdness as of March 2026.

(2020)