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Freeze the Error Contract Before One except Change

This story is from 2026-09-11. It is preserved in the archive; the latest stories are on the live feed.

Mixed None-and-raise APIs fail under model rewrites. The error taxonomy is the real product surface. Pin that taxonomy with characterization tests first, always. Change one except clause only after the pin stays green. Happy-path unit tests will not save this refactor. Callers already branch on Non…

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  1. 2026-09-11 17:33 · DEV Community — AI
    Freeze the Error Contract Before One except Change

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