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The Behavior Fingerprint: One Command That Gates Every Legacy Refactor

This story is from 2026-08-27. It is preserved in the archive; the latest stories are on the live feed.

A refactor is safe when the behavior fingerprint is unchanged. The fingerprint is a hash of probe outputs. One command computes it. One command verifies it. Everything else is ceremony. Local baselines lie. Your laptop has a different locale. Your Python version differs from CI. A missing system li…

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  1. 2026-08-27 07:06 · DEV Community — AI
    The Behavior Fingerprint: One Command That Gates Every Legacy Refactor

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