June 2026 monthly summary for pandas-dev/pandas: Delivered a critical bug fix to preserve the original index when applying Series.dt.isocalendar() to pyarrow-backed datetime/date dtypes, along with regression testing to safeguard index integrity. This work strengthens data integrity and compatibility for users leveraging pyarrow-backed dtypes, and demonstrates solid test-driven development and pull-request hygiene.

December 2024 focused on reliability improvements for google/osv-scanner. The primary delivery was a targeted HTTP retry fix: retries are now performed only for server-side 5xx errors, eliminating retries on 4xx client errors. This reduces unnecessary network calls, lowers noise in error handling, and improves overall scanner stability. Added automated tests in osv_test.go to validate the corrected retry behavior and ensure long-term resilience. No new features were released this month; the work centers on robustness, performance, and correctness of the retry mechanism and its observability.