[kixelated]

Quest: quest/m1/quic/fork/switch, finished and deleted here.

Moves both runtimes off the moq-dev/noq soft fork onto moq-quic, so fixes land once in this repo instead of being backported to moq-dev/noq.

• moq-tokio: quinn's async layer is now the quic::driver module, and web-transport-moq is now quic::web. Both are tokio-only. The first commit is a verbatim copy of quinn 7616e6b2 (the commit moq-quic forked from) and moq-dev/noq e27c0ce0, so the second commit's adaptation diffs cleanly against upstream.
• moq-uring: src/quic/noq becomes src/quic/driver, running on moq-quic. The refactor(quic)!: keep only the noq backend #3811 diff served as the reverse map.
• moq-quic: takes moq_clock::Instant at its boundary, and adds a once-per-connection Draining endpoint event. That event backs Endpoint::wait_all_draining, which noq had and quinn lacks.
• Every moq-noq* and web-transport-moq dependency is gone. Upstream noq-proto stays only for the iroh feature.
• The noq cargo feature is renamed to quic throughout (moq-tokio, moq-uring, moq-relay, moq-cli, moq-bench, moq-hls, moq-transcode, moq-boy, moq-c, hang), along with docs, scripts, and examples. The deprecated moq-native shim keeps its no-op noq feature.
• Session stats now report estimated_send_rate from PathStats::bandwidth_estimate (bytes/s × 8) on both runtimes. BBR3 gives a rate; CUBIC gives none.
• quic::web logs a CONNECT stream cut off by the connection's close at debug instead of warning failed to read capsule e=UnexpectedEnd on every ordinary close. A read error on a live connection still warns. Regression tests cover both.
• CONTRIBUTING.md's Forks section and rs/AGENTS.md's backend list now describe moq-quic, and advisory triage points at rs/moq-quic/README.md.
• The cherry-pick recipe in rs/moq-quic/README.md now also maps quinn/src/ onto rs/moq-tokio/src/quic/driver/. The carried-changes list there adds the clock and Draining changes.

Decisions

Settled by the maintainer:

1. Cargo feature name: ✅ quic / moq-quic / transport
2. moq_tokio::quic::{driver, web}: ✅ public with #[doc(hidden)] / pub(crate) with a test-support feature
3. qlog layout: ✅ one file per endpoint (per dial on moq-uring's connect side) / one per connection
4. PR shape: ✅ one PR / split moq-uring out
5. CONTRIBUTING.md and rs/AGENTS.md: ✅ update the stale noq lines to describe moq-quic, with advisory triage in rs/moq-quic/README.md / leave them
6. moq-native's no-op noq feature: ✅ keep it in the deprecated shim / remove it

Public API

Breaking:

• Cargo feature noq is renamed to quic on every crate that had it.
• moq_tokio::noq (which exported Error) is now moq_tokio::quic::Error.
• moq_tokio::Error::Noq is now moq_tokio::Error::Quic.
• moq_tokio::quic::{driver, web} are #[doc(hidden)] pub, only so workspace tests and moq-uring's interop tests can dial a bare endpoint. They are not a stable API.
• moq-quic's Instant is now moq_clock::Instant. moq-quic is unpublished.
• New in moq-quic: EndpointEvent::is_draining.
• New in the driver: Endpoint::wait_all_draining.
• qlog layout: moq-quic holds one sink per transport config. moq-tokio now writes one file per endpoint (moq-{role}-{pid}-{seq}.sqlog) instead of one per connection. moq-uring writes one per endpoint on accept and one per dial on connect, each event tagged with the connection's qlog group_id.

Wire

No intentional change: same ALPNs, framing, and stream and close codes. The QUIC stack underneath changes from noq to quinn's state machine plus our carried changes, so packet-level behavior follows quinn. The table below lists the noq-only behavior that is carried over.

moq-dev/noq CHANGELOG-MOQ.md

Release	Change	Status here
2.0.5	#38 repeat pending ACK ranges in every Initial/Handshake packet	Ported: upstream quinn has it since quinn#2747, an ancestor of the fork point 7616e6b2
2.0.4	#34 handshake_idle_timeout	Ported in #5163 (moq-quic README). Its PTO-cap part is N/A, because quinn has no such cap
2.0.3	#32 reset PTO backoff on key discard	Ported in #5163
2.0.2	#28 max_datagram_size 0 without negotiated datagrams	Ported with the quic::web move (Session::max_datagram_size)
2.0.1	#25 reassembly cap (RUSTSEC-2026-0185)	Ported: quinn#2789 and #2814 are ancestors of the fork point, and #2694 is their 0.11.x backport. noq's unordered-compaction fix is N/A: quinn's defragment starts at offset 0, not bytes_read
2.0.1	#19 reset before the WebTransport header reports the reset	Ported with the quic::web move
2.0.1	#23 keep H3 control/QPACK streams open until the close capsule is delivered	Ported with the quic::web move
2.0.1	#27 raw QUIC stream codes sent as is	Ported with the quic::web move
2.0.0	#13 web-transport-trait 0.5	Ported with the quic::web move
1.3.2	#11 raw QUIC peer close code	Ported with the quic::web move
1.3.2	#12 classic ECN for BBR	Ported with BBR3 (#4921)
1.3.1	#3 to #9 BBR correctness	Ported with BBR3 (#4921)
1.3.0	#1 packaging as moq-noq*	N/A
1.3.0	#2 web-transport-moq	Ported: it is now moq_tokio::quic::web
(noq#667)	lazy stream slots	Already in moq-quic

Notes for review

• The quic::driver adaptation from upstream:
  • Removed the Runtime/AsyncTimer traits, smol, the futures-io impls, and the lock-tracking mutex.
  • Timers use moq_clock::Sleep and spawning uses tokio::spawn.
  • Added wait_all_draining.
  • The module keeps quinn's formatting through its own .rustfmt.toml. just rs lint/fix format it separately, as with moq_sock::udp.
• Driver test changes:
  • split_accept_driver_lost_before_connection_spawn is dropped, because it needed spawn injection through Runtime.
  • The blocking-handshake client pins X25519. With aws-lc-rs's default post-quantum share, the ClientHello spans two Initials, so the ALPN failure surfaces after registration and split_accept_failure_wakes_idle_waiter failed. Upstream tests run on ring.
• kio 0.6 dropped Fan, so quic::web keeps a small local fan.rs.
• moq-uring still runs its timers on std::time::Instant. One to_std helper maps moq-quic deadlines onto them until quest/m1/time/uring makes the worker a moq-clock backend.

Relay memory

Peak relay RSS over each 10 s sampler run, origin/main (631c341a, moq-noq) against this branch, both on the default Tokio runtime and driven by this branch's moq-bench. Three paired rounds alternate the order. The harness is bench/relay.sh's run_workload, the same one just bench origin/main uses, without the Criterion targets.

Workload	moq-noq (main)	moq-quic (this PR)	Delivered
fanout (#3342's fanout)	35.0, 34.7, 36.8 MiB (median 35.0)	35.2, 35.8, 36.9 MiB (median 35.8)	2.048 Mbps both
fanout-heavy (stands in for #3342's bulk)	133.9, 134.2, 124.1 MiB (median 133.9)	134.1, 125.1, 126.4 MiB (median 126.4)	~147 Mbps both

• moq-quic matches moq-noq: fanout is within 1 MiB, inside the run-to-run spread, and fanout-heavy shows the same bimodal 124/134 MiB split on both stacks.
• feat: default QUIC backends to noq #3342 measured 31 MiB fanout on moq-noq. main's own moq-noq relay now peaks at 35 MiB on the same workload file, so the 4 MiB gap is drift on main since feat: default QUIC backends to noq #3342, not the switch.
• The bulk workload is gone. fanout-heavy (256 subscribers, 60 fps, 1200 B frames) offers 147.456 Mbps, the throughput feat: default QUIC backends to noq #3342 reported for bulk, so it is the closest current equivalent. feat: default QUIC backends to noq #3342's 75 MiB is not comparable for the same drift reason. The paired base is the comparison that counts.
• The machine was shared (1-minute load 20 to 56 during the runs). RSS barely depends on load, and the CPU and throughput columns are not reported as a comparison.
• Only the Tokio runtime was measured, not io_uring workers.

Testing

• The first full just check run passed every test: 7872 passed, 31 skipped. It failed only on cargo fmt in one relay test. After formatting, a rerun stopped on io_uring tests that could not allocate memory: io_uring's locked memory counts against one 8 MiB RLIMIT_MEMLOCK shared by every process of this user, and other agents on the machine were using it. sh/rs/select.sh lint --all (fmt, clippy, doc, shear, sort, tokio-features, net-features, wasm, uring-check, media-features) then passed, as did just rs tokio-features --all.
• just rs uring: all 434 relay plus io_uring tests passed. The qlog leg's failures were all the same locked-memory exhaustion.
• moq-uring qlog: tests/qlog.rs and the unit tests pass with --features qlog. moq-tokio's quic_qlog passes.
• New regression test draining_is_reported_once_before_drained (moq-quic).
• just test interop --all: all 68 checks passed (rust, python, go, cpp, js, node, bun, c, gst; denied tokens; browser close code; CLI FETCH; finite tails).
• capsule_read_ends_quietly_with_connection fails without the log fix. capsule_read_truncated_warns keeps the live-connection warning.
• Not run: the Criterion benchmark matrix against moq-noq. just bench origin/main runs 43 Criterion targets for both trees, and on this shared machine the timings would be noise. Run it on a quiet host if a throughput or latency comparison beyond the relay workloads above is wanted.

🤖 Generated with Claude Code

(Written by Claude Opus 5.5)

[kixelated]

Quest-start outcome for quest/m1/quic/fork/switch. This was a background run; the PR stays a draft.

Landed: everything in the quest's Goal:

• moq-tokio and moq-uring both run on moq-quic.
• Every moq-noq* and web-transport-moq dependency is gone. Upstream noq remains only for iroh.
• moq_clock::Instant at moq-quic's boundary.
• The noq feature is renamed to quic.
• The cherry-pick recipe covers quinn/src/.
• Bandwidth comes from PathStats::bandwidth_estimate.
• moq-uring's qlog feature works on quinn's qlog.
• src/quic/noq is now src/quic/driver.

Checks:

• Tests, lint, and feature checks pass.
• just test interop --all passes (68/68).
• Not run: the benchmark and memory workloads (see Testing).

Decisions for the maintainer (recommendation first):

1. Feature name quic. Recommend keeping it: named by role, and it matches moq-relay's existing _quic. Alternative: moq-quic.
2. moq_tokio::quic::{driver, web} are #[doc(hidden)] pub so workspace tests and moq-uring interop tests can reach a bare endpoint. Recommend keeping that. Alternatives: a test-support feature, or documenting web as a supported API.
3. qlog is now one file per endpoint, or per dial on moq-uring's connect side, instead of one per connection. Recommend accepting it, since events carry group_id. Alternative: port noq's per-connection QlogFactory into moq-quic, which adds a carried change.
4. One PR rather than a moq-tokio/moq-uring split. Removing moq-noq-proto needs both, and the uring port is about 150 lines. Recommend keeping one PR.
5. CONTRIBUTING.md (lines 77-80, the moq-dev/noq fork and advisory process) and rs/AGENTS.md (the backend list) are now stale. I did not edit them, per repo rules. Recommend that the maintainer point advisory triage at rs/moq-quic/README.md.
6. The deprecated moq-native shim keeps its no-op noq feature. Recommend leaving it until the shim is deleted.

Suggested follow-ups:

• Freeze moq-dev/noq: delete moq-sync.yml and mark its README frozen. This is quest/m1/quic/fork/README.md's own work, and should happen once this merges.
• Run just bench origin/main on a quiet host for the relay RSS and throughput comparison. The feat: default QUIC backends to noq #3342 numbers were 75 MiB bulk and 31 MiB fanout; bulk no longer exists, so compare fanout.
• quest/m1/time/uring: replace moq-uring's to_std clock bridge.
• quic::web logs failed to read capsule e=UnexpectedEnd at WARN on an ordinary close. This is inherited from web-transport-moq; consider debug.

(Written by Claude Opus 5.5)

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ℹ️ Recent review info

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📒 Files selected for processing: 4

• rs/moq-tokio/src/log.rs
• rs/moq-tokio/src/quic/backend.rs
• rs/moq-tokio/src/quic/driver/endpoint.rs
• rs/moq-uring/README.md

🚧 Files skipped from review as they are similar to previous changes: 3

• rs/moq-tokio/src/log.rs
• rs/moq-uring/README.md
• rs/moq-tokio/src/quic/driver/endpoint.rs

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.

Walkthrough

The pull request replaces the Noq QUIC backend with moq-quic in the Tokio and io-uring integrations. It adds a Tokio QUIC driver and WebTransport implementation, updates QUIC lifecycle events and qlog timestamps, and changes feature names, dependencies, tests, benchmarks, and documentation.

Priority: ➖ Normal

Merge Risk: ⚪ Minimal · up to c1f4c

The inspected QUIC feature, lifecycle, WebTransport, and qlog paths show no established issue that should block merging.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 53.31% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 604 functions across 50 files. (1 skipped…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly and concisely describes the primary change: moving moq-tokio and moq-uring to moq-quic.
Description check		The description directly explains the runtime migration, feature renaming, API changes, documentation updates, testing, and compatibility decisions covered by the changeset.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 53.31% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 604 functions across 50 files. (1 skipped: 1 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

• Fix all pre-merge checks with AI

✨ Finishing Touches

✨ Simplify code

• Commit to this branch
• Create a new PR

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Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-16T14:52:03.938135Z	c1f4cfd	New commits

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Reviewed commit: 5b7bff2f24

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[kixelated]

Automated review by review (OpenAI)

Reviewed commit: 188b08c

No actionable bugs found in the supported transport paths. The independent error-enum extensibility finding is addressed by the latest non_exhaustive annotations.

Direction: consolidating the state machine and carried changes in-tree is coherent. Compared adaptations against the repository's imported baseline, including Tokio/uring lifecycle and stream I/O, WebTransport shutdown/code mapping, clock boundaries, qlog ownership, bandwidth units, and feature/provider wiring. The intentional breaking feature/API renames are documented; iroh remains separate.

Verification limits: static GitHub review only, not independently executed builds, interop, browser or performance tests. Upstream provenance/security claims were not verified outside this repository. Qlog tests could additionally cover multiple connections sharing one sink with distinct group_id values and timestamp deltas; runtime compatibility and performance still depend on the stated test/benchmark evidence.

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Reviewed commit: 188b08c30d

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Reviewed commit: 5d21b4f

The pending/queued-accept finding is addressed by counting pending accepts and refusing queued attempts during close: #5664 (comment). The earlier enum fix remains intact.

One new P3 notification gap remains for direct use of the doc-hidden driver API without close(), detailed inline. Normal Server::shutdown calls close() and is not implicated by this finding.

Direction: retain this focused lifecycle fix and complete notification coverage for the newly expanded predicate. No additional supported-path regression found.

Verification: incremental static GitHub review; no tests executed. The two new tests cover queued/pending accepts during close, not an already-parked draining waiter followed by rejection without close.

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💡 Codex Review

moq/rs/moq-tokio/src/quic/backend.rs

Lines 630 to 632 in 21cac2b

	if let Ok(res) = io.try_io(tokio::io::Interest::READABLE, || self.state.recv(io.into(), bufs, meta)) {
	return Poll::Ready(Ok(res));
	}

Return non-WouldBlock receive errors

When the socket reports a persistent receive error other than WouldBlock, this branch discards it and immediately loops. Tokio leaves readiness asserted for such errors, so poll_recv_ready completes again at once and the endpoint task spins while holding its state lock, consuming a core and preventing connection progress instead of terminating with the I/O error. Match the error handling already used in quic/driver/runtime/tokio.rs: retry only WouldBlock and return every other error.

AGENTS.md reference: AGENTS.md:L17-L17

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Actionable comments posted: 3

---

• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
Review comments at @rs/moq-tokio/src/log.rs:
- Line 57: Add an info-level directive for the moq_quic target to the EnvFilter
configuration alongside the existing moq_tokio::quic::driver directive, so debug
logs from the QUIC state machine remain capped.

Review comments at @rs/moq-tokio/src/quic/driver/endpoint.rs:
- Around line 62-64: Update the endpoint documentation example to use the
publicly re-exported moq_tokio::quic::driver::Endpoint instead of
quinn::Endpoint, and mark the Rust code block no_run so doctests compile without
executing Endpoint::client outside a Tokio runtime.

Review comments at @rs/moq-uring/README.md:
- Line 85: Replace the `cargo test` command in the README with the repository’s
`just` recipe for running the QUIC test suite, so tests use nextest and its
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📒 Files selected for processing: 116

• CONTRIBUTING.md
• Cargo.toml
• doc/bin/cli.md
• doc/bin/relay/config.md
• doc/setup/upgrade.md
• quest/m1/p2p/native-quic.md
• quest/m1/p2p/udp-demux.md
• quest/m1/quic/fork/README.md
• quest/m1/quic/fork/switch.md
• quest/m1/quic/receive-credit.md
• quest/m1/time/README.md
• quest/m1/time/relay-seam.md
• quest/m1/time/uring.md
• quest/m2/quic-bbr-loss-parity.md
• quest/m2/quic-sim.md
• rs/AGENTS.md
• rs/hang/Cargo.toml
• rs/justfile
• rs/moq-bench/Cargo.toml
• rs/moq-boy/Cargo.toml
• rs/moq-c/Cargo.toml
• rs/moq-cli/Cargo.toml
• rs/moq-gst/src/lib.rs
• rs/moq-hls/Cargo.toml
• rs/moq-quic/Cargo.toml
• rs/moq-quic/README.md
• rs/moq-quic/src/config/transport.rs
• rs/moq-quic/src/connection/mod.rs
• rs/moq-quic/src/connection/qlog.rs
• rs/moq-quic/src/endpoint.rs
• rs/moq-quic/src/lib.rs
• rs/moq-quic/src/shared.rs
• rs/moq-quic/src/tests/mod.rs
• rs/moq-quic/src/tests/util.rs
• rs/moq-relay/Cargo.toml
• rs/moq-relay/src/config.rs
• rs/moq-relay/src/relay.rs
• rs/moq-relay/src/shutdown.rs
• rs/moq-relay/tests/cluster_idle.rs
• rs/moq-relay/tests/drills.rs
• rs/moq-relay/tests/goaway_cluster.rs
• rs/moq-relay/tests/runtime_uring.rs
• rs/moq-sock/src/bind.rs
• rs/moq-tokio/Cargo.toml
• rs/moq-tokio/README.md
• rs/moq-tokio/src/client.rs
• rs/moq-tokio/src/connect.rs
• rs/moq-tokio/src/connection.rs
• rs/moq-tokio/src/error.rs
• rs/moq-tokio/src/iroh.rs
• rs/moq-tokio/src/lib.rs
• rs/moq-tokio/src/listen.rs
• rs/moq-tokio/src/log.rs
• rs/moq-tokio/src/quic.rs
• rs/moq-tokio/src/quic/backend.rs
• rs/moq-tokio/src/quic/driver/.rustfmt.toml
• rs/moq-tokio/src/quic/driver/connection.rs
• rs/moq-tokio/src/quic/driver/endpoint.rs
• rs/moq-tokio/src/quic/driver/incoming.rs
• rs/moq-tokio/src/quic/driver/mod.rs
• rs/moq-tokio/src/quic/driver/mutex.rs
• rs/moq-tokio/src/quic/driver/recv_stream.rs
• rs/moq-tokio/src/quic/driver/runtime/mod.rs
• rs/moq-tokio/src/quic/driver/runtime/tokio.rs
• rs/moq-tokio/src/quic/driver/send_stream.rs
• rs/moq-tokio/src/quic/driver/tests.rs
• rs/moq-tokio/src/quic/driver/work_limiter.rs
• rs/moq-tokio/src/quic/web/client.rs
• rs/moq-tokio/src/quic/web/connect.rs
• rs/moq-tokio/src/quic/web/crypto.rs
• rs/moq-tokio/src/quic/web/error.rs
• rs/moq-tokio/src/quic/web/fan.rs
• rs/moq-tokio/src/quic/web/mod.rs
• rs/moq-tokio/src/quic/web/recv.rs
• rs/moq-tokio/src/quic/web/send.rs
• rs/moq-tokio/src/quic/web/server.rs
• rs/moq-tokio/src/quic/web/session.rs
• rs/moq-tokio/src/quic/web/settings.rs
• rs/moq-tokio/src/resolve.rs
• rs/moq-tokio/src/server.rs
• rs/moq-tokio/src/tcp.rs
• rs/moq-tokio/src/tls.rs
• rs/moq-tokio/src/transport.rs
• rs/moq-tokio/src/websocket.rs
• rs/moq-tokio/src/worker/group.rs
• rs/moq-tokio/src/worker/mod.rs
• rs/moq-tokio/tests/backend.rs
• rs/moq-tokio/tests/broadcast.rs
• rs/moq-tokio/tests/close_code.rs
• rs/moq-tokio/tests/stream_code.rs
• rs/moq-tokio/tests/worker.rs
• rs/moq-transcode/Cargo.toml
• rs/moq-uring/Cargo.toml
• rs/moq-uring/README.md
• rs/moq-uring/benches/echo_quic.rs
• rs/moq-uring/benches/session_lite.rs
• rs/moq-uring/src/lib.rs
• rs/moq-uring/src/quic/driver/connection.rs
• rs/moq-uring/src/quic/driver/endpoint.rs
• rs/moq-uring/src/quic/driver/mod.rs
• rs/moq-uring/src/quic/driver/stream.rs
• rs/moq-uring/src/quic/endpoint.rs
• rs/moq-uring/src/quic/mod.rs
• rs/moq-uring/src/quic/qlog.rs
• rs/moq-uring/src/quic/web.rs
• rs/moq-uring/tests/echo.rs
• rs/moq-uring/tests/ecn.rs
• rs/moq-uring/tests/endpoint.rs
• rs/moq-uring/tests/identity.rs
• rs/moq-uring/tests/qlog.rs
• rs/moq-uring/tests/session.rs
• rs/moq-uring/tests/teardown.rs
• rs/moq-uring/tests/web.rs
• rs/moq-uring/tests/workers.rs
• sh/rs/select.test.py
• sh/rs/tokio-features.sh

💤 Files with no reviewable changes: 5

• quest/m1/time/relay-seam.md
• quest/m1/time/uring.md
• quest/m1/quic/receive-credit.md
• quest/m2/quic-bbr-loss-parity.md
• quest/m1/quic/fork/switch.md

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 0 remain after this review.

[kixelated]

Codex P2 on 21cac2b (backend.rs receive loop): fixed in c1f4cfd. Socket::poll_recv now retries only WouldBlock and returns every other error, matching quic/driver/runtime/tokio.rs; the driver still skips ConnectionReset and EMSGSIZE itself. The same loop exists on main in noq.rs, so this also fixes the pre-existing behavior. No regression test: forcing a persistent non-WouldBlock error on a real tokio UdpSocket is not easy.

(Written by Claude Opus 5.5)

[kixelated]

Automated review by review (OpenAI)

Reviewed commit: c1f4cfd.

No new actionable bugs found in this incremental update. The prior draining-waiter finding is fixed, with a counting-waker regression. The UDP adapter now retries only WouldBlock and forwards other errors to the driver's existing classification/cleanup path, avoiding the adapter's persistent-error spin. Logging and documentation findings are also addressed.

Direction: these focused fixes preserve the existing driver lifecycle and error handling; no additional abstraction is needed. A fault-injected receive-error regression would improve coverage, since the new test exercises queue-draining notification rather than this socket path.

Verification limits: static GitHub inspection of the delta and relevant surrounding code only. No builds, tests, interop or performance runs executed; no external repository inspection.

(Written by OpenAI)