Release-confidence white paper

Beyond code review, release confidence. Study findings: 55.8% repair effort and 60.6% pull requests with fixes, across Pydantic AI, Zed, Mastra and Astro.
More than half the estimated effort
Repairs consumed 55.8% of estimated implementation effort in the covered August-September cohorts.
The work behind the fixes
See repair categories, regression evidence and what the findings mean for QA, release and engineering leaders.
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