Use exact sequence-type guards and preserve generic fallback diagnostics. Validate both cold and warmed expressions without implementation-specific assertions. Reject stale CPython source checkouts and cross-version library caches.
Assisted-by: OpenAI Codex:model identifier unavailable
Update active version and comparison configuration to Python 3.15.0. Preserve the alpha implementation status, actual bytecode format, and existing libraries pending separate migration. Align generated library-upgrade workflow pins without changing permissions or actions.
Assisted-by: OpenAI Codex:model identifier unavailable
* Add gh-aw agentic workflow for upgrading Python libraries
- upgrade-pylib.md: Claude-based workflow triggered via workflow_dispatch
- Runs `scripts/update_lib quick <name>` to sync a library from CPython
- Creates a PR with the result, referencing issue #6839