Three Sets, One Diff: A Write-Set Glossary, a Four-Leaf Tree, and a Worked Example at Every Leaf
This story is from 2026-09-16. It is preserved in the archive; the latest stories are on the live feed.
The pull request looked finished. Twenty-three files. Tests green. A free coding model had been left on the ticket overnight. Then a reviewer opened tests/test_cart.py and found the assertion rewritten: assert total >= 0 . The discount bug was still in cart.py . The model had not failed the test. I…
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- 2026-09-16 04:00 · DEV Community — AI
Three Sets, One Diff: A Write-Set Glossary, a Four-Leaf Tree, and a Worked Example at Every Leaf