Canada, which inverts nearly all of it

Eleven more generators, and almost every American assumption goes the other way.

Where the SSN and EIN carry no checksum, the SIN and Business Number are both Luhn-checked — genuinely verifiable, so invalid=true breaks real arithmetic instead of merely violating a range. Where the US has no account-number standard, Canada has CPA Standard 006, fixed at 7 or 12 digits.

My favourite piece of real-world mess: the transit number is returned in both renderings — XXXXX-YYY as printed on a cheque, 0YYYXXXXX for electronic transfer — and the field order reverses between them. A system that accepts one routinely chokes on the other. That's a production bug somewhere right now.

Bilingual throughout: Ltée and ULC beside Inc., plates for all 13 provinces and territories, and QC / Quebec / Québec all resolving to the same place.