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Characterize Failure Tokens Before You Extract a Predicate

This story is from 2026-09-08. It is preserved in the archive; the latest stories are on the live feed.

A messy validator is unsafe until reject paths freeze. Characterization of failures still beats a pretty extract. Change one predicate only after the matrix holds. The damage pattern Happy-path tests miss most damage from refactors. Callers depend on failure shape, not structure. Exit codes remain…

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  1. 2026-09-08 16:31 · DEV Community — AI
    Characterize Failure Tokens Before You Extract a Predicate

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