Notes
Working notes on reading a page that was never made fillable, and on the tests that keep it honest.
Reading a form nobody made fillable
How a scanned 1099 with no text layer and no form fields becomes 33 boxes you can type into, in about 300 milliseconds.
Scoring a detector honestly
Eyeballing one PDF is not evidence. Forty-one published forms, an answer key that was not invented, and the two bugs that only showed up at scale.