fix(net): end a resumed track the way a direct one ends by kixelated · Pull Request #6136 · moq-dev/moq

kixelated · 2026-10-21T01:54:08Z

Completes quest/m1/resume-closed.md. A resumed JS Track.Subscriber (one reading a front's route copies) now ends the way a direct subscriber does.

Changes

closed settles on a clean end. It settles when the serving copy closes cleanly, or when either read channel drains that copy cleanly. It no longer waits for both groups and datagrams to be polled to EOF. The reader then leaves the route and lets go of each copy (its subscription and the route source) once the copy holds nothing left to read: no unread group, no buffered datagram within its cursor, and no group still read from a copy it replaced that could continue from it. The other channel's backlog stays readable, so a resumed closed === null no longer short-circuits reads in track.ts.
A clean end still waits for groups in flight on a replaced copy. Merged with moq-dev/moq#6141: on every path above, the track ends only once no group the reader lacks may still land below the end on a copy it replaced, within the reader's budget. A replaced copy's group that already landed but is unread keeps the copy readable without holding closed back, as a direct reader's buffer does.
The declared end holds across swaps. end() and finished() answer from the first end any copy declared, not just the serving copy's. A later copy declaring a different end is refused with Incompatible: the reader closes, dropping its copies and leaving the route, and its reads fail with it. closed settles with the refusal unless it already settled cleanly. An end is learned before its copy is let go, so a copy dropped before reporting it still binds later copies. A mid-group end that refines the group boundary it falls just before is accepted, as #endPending accepts it on the wire. Replaced copies are bounded at that logical end. Before each read, the end is also checked against every group and datagram any copy holds (its largest counts both) or the reader handed out: an end below them, or a later group past it, is refused the same way, as a direct track refuses an end below what it received.
largest() ends at a clean end. It resolves undefined once the serving copy ends cleanly (closed, or its largest reached the declared end), even while the front stays open. The final largest is kept after that copy goes.
close(abort) reaches the groups handed out. Reader.close(abort) closes every group still handed out and every copy with the abort. GroupConsumer.close(abort) on a recovering group whose copy failed now ends with the abort, not the copy's failure. A recovery in flight therefore settles with the abort and never adopts a replacement.
Every group handed out is recorded for the copies that may back it, not only those handed out while copies overlap, so a later route's copy that ends cleanly stays while it holds a group read from the copy it replaced.
Recovery after a clean end continues only from a copy that still holds the group. There is no route left to wait for, so it never waits on one.

Public API: behavior only. Wire: none.

Tests

Nineteen regression tests in js/net/src/resume.test.ts, each failing without the fix:

a group-only reader, and a group-only fork, of a finite track settle closed and drop the copy's demand
the serving copy closing cleanly settles closed, and its datagrams stay readable
the serving copy closing cleanly with nothing read settles closed only once a group the replaced copy may carry lands or passes the budget (two cases, on a mocked clock)
an end a replaced copy declared holds across a swap, and a different end is refused and releases both copies, including one a retained copy declares after a clean end
an end holds when its copy is let go in the same turn it declared it
a datagram below the group floor does not keep a finite track's copy
after a clean end, a group read from a replaced copy that fails continues from the ended serving copy
largest() ends at the declared end while the front is open
close(abort) rejects a pending frame read with the abort, both directly and with a recovery in flight
a group handed out before a swap continues from the new copy after that copy ended cleanly
an end below a group another copy handed out or buffered is refused, and so is a group past the declared end on another copy
an end below a datagram another copy handed out or buffered is refused, including a handed-out datagram newer than the last one handed out

a replaced copy backs a group before its first arrival (from moq-dev/moq#6141) now fails copy a after it is replaced rather than closing it cleanly while it serves: the serving copy closing cleanly now ends the track, and a clean close declares an end that copy c's later groups would contradict. The test still covers what it did: a never holds the group.

just check passes.

Decisions

Settled by the maintainer (2026-10-21): take both recommendations.

How far a mismatched end is refused. ✅ Keep it per reader: only the reader that sees the mismatch closes, with Incompatible. Each reader checks against its own record, and a route-level route.refuse(...) would also stop readers that never saw the bad copy.
closed on channel EOF of a copy that is still open. ✅ Keep it: a copy declared with finishAt that delivered everything settles the resumed closed at group or datagram EOF, while a direct subscriber's closed waits for the producer to close. The logical track is complete, and settling releases the route's copy, which is the leak this quest targets.

Follow-ups

Rust has the same gap across swaps: resume::Reader::poll_finished reads only the serving copy. Planned as quest/m1/resume-rust-end.md.

(Written by Claude Opus 5.5)

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

A resumed JS subscriber settles closed once its serving copy ends cleanly, leaves the route and lets go of copies with nothing left to read, keeps the first end any copy declared (refusing a different one), resolves largest() undefined at a clean end, and carries a close(abort) to the groups it handed out and any recovery in flight. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated · 2026-10-21T01:54:14Z

Outcome: the quest is implemented. All four behaviors are fixed, and each one has a regression test that fails without the fix. just check passes. The PR stays a draft for two decisions listed in the description, the scope of a mismatched-end refusal and closed on channel EOF; I recommend keeping both as they are. Suggested follow-ups: carry the declared end across swaps in Rust (resume::Reader::poll_finished), and have quest/m1/resume-in-flight.md own letting go of replaced copies after a clean end.

(Written by Claude Opus 5.5)

Resolve js/net resume conflicts with #6141: the clean end now concludes only once no group the reader lacks may still land on a replaced copy, on every path (group drain, datagram drain, the serving copy closing). A replaced copy's unread group keeps it without delaying closed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated · 2026-10-21T18:13:00Z

@codex review

(Written by Claude Opus 5.5)

coderabbitai · 2026-10-21T18:13:13Z

Walkthrough

The resumed reader now tracks a logical end across copies and coordinates clean completion with unread groups and datagrams. Reads can continue from retained data after a clean close, while conflicting end declarations and aborts return errors. The changes also add regression tests and remove the related quest specification and links.

Priority: ➖ Normal

Merge Risk: 🟡 Moderate · up to b25fd

When a route is replaced and the old route closes cleanly, the resumed track can report an early end. The continuing route can then fail with an Incompatible error. This is reachable in the replacement scenario the PR's own tests exercise, so it should be resolved or explicitly accepted before merge.

Pre-merge checks: 5

Check name	Status	Explanation
Title check		The title clearly summarizes the main change: resumed tracks now end like direct tracks.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 5…
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.
Description check		The pull request description directly describes the resumed JavaScript Track.Subscriber clean-end behavior, copy-swap handling, abort propagation, regression tests, and related documentation changes.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 5 files.

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chatgpt-codex-connector · 2026-10-21T18:13:16Z

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-22T21:22:42.920474Z	`76b1223`	Manual request

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chatgpt-codex-connector · 2026-10-21T18:17:48Z

+			const state = subscriber.#state;
+			return (
+				(state.closed.peek() !== undefined || subscriber.#complete()) &&
+				state.datagrams.peek().length === 0 &&


Exclude permanently out-of-range datagrams from spent

When a datagram is buffered and the subscriber subsequently raises its group floor past that datagram before the finite copy ends, spent remains false solely because the datagram array is nonempty. Since setGroups cannot lower the floor and recvDatagram would only discard this datagram, a group-only reader never releases the copy, its demand, or its route source unless it explicitly polls the unrelated datagram channel. A peer can therefore pin these resources with one obsolete datagram per reader; check whether any buffered datagram is still within [start, end) rather than checking the raw array length.

AGENTS.md reference: AGENTS.md:L18-L18

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Fixed in 847dd75: spent now counts only datagrams inside the copy's cursor, so one below the floor no longer pins the copy. Regression test: a datagram below the group floor does not keep a finite track's copy.

(Written by Claude Opus 5.5)

chatgpt-codex-connector · 2026-10-21T18:17:48Z

+		} else {
+			this.#shell.close(new Incompatible(this.route.name));
+		}


Reject mismatched ends reported after a clean conclusion

If the serving copy ends cleanly while a replaced copy is retained for an unread buffered group, #conclude settles the shell with null before that retained copy necessarily declares its end. When the retained copy later reports a conflicting end, this call cannot replace the already-set clean terminal value and does not close its groups or copies, so the reader continues exposing data from a copy that should have been refused while closed still reports success. The late mismatch must still terminate the retained copy/read path with Incompatible.

AGENTS.md reference: AGENTS.md:L67-L67

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Fixed in 847dd75: a mismatched end after the clean end closes the reader with Incompatible, aborting its handed-out groups and copies, and later reads fail with it. closed stays null since it already settled. Regression test: a retained copy declaring another end after a clean end fails the reads.

(Written by Claude Opus 5.5)

… late end A datagram below the group floor no longer keeps a finite track's copy after a clean end, since a read would only discard it. A retained copy declaring another end after the track ended cleanly fails the reads with Incompatible instead of serving content it claims differently. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated · 2026-10-21T18:24:13Z

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chatgpt-codex-connector · 2026-10-21T18:29:50Z

+				if (!this.#ended || copy.lease > 0) return true;
+				const start = Math.max(cursor.start, copy.floor ?? 0);
+				if (!hooks.spent(copy.sub, start, undefined, delivered)) return true;


Keep the final copy that backs an open group

When a group has been handed out from replaced copy A and the clean-ending serving copy B holds the completed duplicate, delivered already contains that sequence, so hooks.spent ignores B's buffered group and this branch drops B even though an open Recover still depends on it. If A subsequently stalls, the recovery waits forever on the detached route; if A fails, it surfaces A's route error instead of completing from B. Before dropping the serving copy, retain it when it holds or may still receive a group referenced by this.out, as the replaced-copy path does.

AGENTS.md reference: AGENTS.md:L67-L67

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Fixed in b25fdae: after a clean end, the serving copy also stays while it holds or may still get a group in out, through the same check the replaced-copy path uses (now #backs). Regression test: a clean end keeps the serving copy while a group read from a replaced one may continue from it, which failed with the old route's SessionClosed before.

(Written by Claude Opus 5.5)

…y continue from it After a clean end, the serving copy stays while it holds or may still get a group handed out from a copy it replaced, so a failure of that copy continues from it instead of ending the group. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated · 2026-10-21T18:35:59Z

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chatgpt-codex-connector · 2026-10-21T18:40:42Z

+		copy.sub.finished().then(
+			// A copy already let go says nothing more about the track.
+			(end) => {
+				if (this.#copies.includes(copy)) this.#declare(end);
+			},


Record a declared end before dropping its copy

When a copy declares its end and the route is swapped in the same turn, a datagram poll can drop the replaced copy before this queued finished() callback runs. The includes check then discards an end that was already declared, so a later copy can report a conflicting end without being rejected. Capture the end synchronously before dropping a copy, or otherwise preserve declarations made before removal.

AGENTS.md reference: AGENTS.md:L67-L67

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Fixed in 1708a99: #letGo learns every copy's declared end before dropping any, so a copy let go before its finished() callback still binds later copies. Regression test: an end a replaced copy declared holds once the copy is let go in the same turn.

(Written by Claude Opus 5.5)

chatgpt-codex-connector · 2026-10-21T18:40:42Z

+			this.#refused = new Incompatible(this.route.name);
+			this.close(this.#refused);
+		} else {
+			this.#shell.close(new Incompatible(this.route.name));


Release copies when rejecting a mismatched end

When two live copies declare conflicting ends before the logical track concludes, this branch only settles the shell with an error; it does not close the reader, leave the route, or drop its copies. Subsequent group and datagram reads short-circuit on the shell error before reaching #letGo, so an untrusted peer can keep the route source and subscription demand pinned indefinitely unless the application explicitly calls close(). Terminate the reader here as the post-conclusion mismatch branch does.

AGENTS.md reference: AGENTS.md:L18-L18

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Fixed in 1708a99: a mismatched end now always closes the reader with Incompatible (dropping its copies and leaving the route), settling closed with it unless it already settled cleanly. an end a replaced copy declared holds across a swap now also checks both copies' demand is released.

(Written by Claude Opus 5.5)

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Inline comments:
Review comments at @js/net/src/resume.ts:
- Around line 371-377: Update the finished-copy callback in #add so a clean
automatic close only calls #declare when the completed copy is still the serving
copy, preventing replaced copies from stamping the logical track end. Preserve
clean-close handling for the active serving copy and allow explicit finishAt or
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📥 Commits

Reviewing files that changed from the base of the PR and between a42689d and b25fdae.

📒 Files selected for processing: 8

js/net/src/group.ts
js/net/src/internal.ts
js/net/src/resume.test.ts
js/net/src/resume.ts
js/net/src/track.ts
quest/m1/README.md
quest/m1/resume-closed.md
quest/m1/resume-rust-end.md

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quest/m1/README.md
quest/m1/resume-rust-end.md
quest/m1/resume-closed.md

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…end is kept A copy declaring another end now closes the reader with Incompatible, dropping its copies and leaving the route, before a clean end as well as after. Ends are learned before letting go of copies, so a copy dropped before its finished() callback still binds later copies. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated · 2026-10-21T18:44:48Z

@codex review

(Written by Claude Opus 5.5)

chatgpt-codex-connector · 2026-10-21T18:47:49Z

Codex Review: Didn't find any major issues. More of your lovely PRs please.

Reviewed commit: 1708a99e64

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kixelated · 2026-10-22T01:08:45Z

Re-queued at 9c06f7c. It left the queue on main's moq-net test-build break, which moq-dev/moq#6223 fixed.

Merged origin/main. The only conflict was in quest/m1/README.md: main had deleted the resume-outage entry and this PR deleted resume-closed, so both entries are gone. quest check passes.
just check passes.
No new review: since Codex's clean review of 1708a99, the only change is the main merge.

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chatgpt-codex-connector · 2026-10-22T01:13:52Z

+				const start = Math.max(cursor.start, copy.floor ?? 0);
+				if (!hooks.spent(copy.sub, start, undefined, delivered)) return true;
+				// A group read from a copy it replaced may still continue from it.
+				if (this.#backs(copy, true, grace(this.#budget()))) return true;


Retain duplicates for groups handed out before a swap

When a group is handed out while its copy is the only copy, its Recover is not added to out; if the route then swaps and the new serving copy contains the duplicate but ends cleanly before the next frame read, this #backs check cannot see the still-open group and drops the new copy as spent. A later failure of the original copy can no longer resume from the already-buffered duplicate, so retention must also cover groups handed out before the overlap began.

AGENTS.md reference: AGENTS.md:L67-L67

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Fixed in 74550db. Every group handed out is now recorded for the copies that may back it, not only those handed out while copies overlap. Regression test: a clean end keeps the serving copy while a group handed out before the swap may continue from it.

(Written by Claude Opus 5.5)

chatgpt-codex-connector · 2026-10-22T01:13:52Z

+		if (!declared) {
+			this.#declared = end;
+			this.wake();


Reject a first end that precedes data from another copy

When a replaced copy has already delivered or buffered a later sequence but has not declared its own end, a serving copy can first declare an end below that sequence and this branch accepts it unconditionally. The reader can consequently return group 5 and later report a clean end at group 3, or silently discard the replaced copy's unread later groups; validate a first declaration against every copy's observed data before binding the logical end.

AGENTS.md reference: AGENTS.md:L67-L67

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Fixed in 74550db, a bit wider than the first declaration: before each read, the declared end is checked against every group and datagram any copy holds or the reader handed out. An end below them, or a later group past it on a copy with no end of its own, is refused with Incompatible, as a direct track refuses an end below what it received. Regression tests: an end below a group another copy (handed out|buffered) is refused and a group past the declared end on another copy is refused.

(Written by Claude Opus 5.5)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

… refuses data past its end Every group handed out is recorded for the copies that may back it, not only those handed out while copies overlap: a later route's copy that ends cleanly now stays while it holds a group read from the copy it replaced. The declared end is checked against every group and datagram any copy holds or the reader handed out, before each read: a copy declaring an end below them, or holding data past it, claims other content and is refused with Incompatible, as a direct track refuses an end below what it received. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated · 2026-10-22T05:49:51Z

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chatgpt-codex-connector · 2026-10-22T05:52:21Z

+			const final = finalSequence(declared);
+			const seen = (sequence: number | undefined) => sequence !== undefined && sequence >= final;
+			if (
+				seen(this.#newest) ||
+				seen(this.#datagram) ||
+				this.#copies.some((copy) => seen(hooks.latestSequence(copy.sub)))


Enforce mid-group ends across every copy

When one copy declares an end such as { group: 2, frame: 1 } and another route's copy has multiple frames in group 2 before declaring its own end, this validation compares only group sequences through finalSequence. The resumed reader can therefore return frame 1 and later frames even though its logical exclusive end forbids them. Validate the declared frame boundary against the end group on every copy and refuse a copy that has already passed it, as a direct track does.

AGENTS.md reference: AGENTS.md:L67-L67

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Deferred to a follow-up, by the maintainer's call: a per-reader cap on a resumed JS group at a mid-group logical end, which needs a consumer-level frame cap rather than the shared producer's limitGroup. The wider check of the end against every copy's data also carries into Rust's resume-rust-end quest. This PR merges at 74550db.

(Written by Claude Opus 5.5)

kixelated · 2026-10-22T05:58:26Z

Queued at 74550db.

Merged origin/main (0ad3c81): kept both start() from moq-dev/moq#6206 and this PR's end tracking in resume.ts/internal.ts, and aligned the quest entries.
74550db fixed Codex's two findings on 9c06f7c: groups handed out before a swap are backed by the new copy, and the declared end is checked against every copy's data.
Codex's mid-group finding on 74550db is deferred to a follow-up by the maintainer.
just check passes.

(Written by Claude Opus 5.5)

…ross a flap back A group or datagram at or past the declared end, handed out or on any copy, now refuses the resumed track, matching the JS reader in #6136. Two tests that finished a replaced copy while another route continued now end it without declaring an end. An in-flight group's recovery treats a route that returned to the copy it reads as no change, adopting the new generation, so an unpolled flap back neither refuses a sparse group nor fetches a dense one from itself. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Resolves js/net resume.ts and resume.test.ts against #6251, #6230, #6222 and #6209: keeps main's verdict check and identity-based datagram dedup, and tracks the newest datagram handed out separately so a declared end is still checked against it now that `#datagram` is the last one. Renames `advanceAsync` to `advance` for the new manual clock. Drops the quest links to the finished resume-closed, recovery-verdicts and resume-datagrams quests. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated · 2026-10-22T21:10:15Z

@codex review

Merged main at eb26b21. Beyond the mechanical merge: with moq-dev/moq#6209's identity dedup, #datagram is now the last datagram handed out rather than the newest, so the reader tracks #newestDatagram for the declared-end check. Recover.#replace keeps both this PR's reader.ended throw and moq-dev/moq#6251's verdict throw.

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The declared end was checked against every copy's latest group, which counts no datagrams, so a replaced copy's buffered datagram past the end let a clean end through. Check each copy's largest too, which does. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated · 2026-10-22T21:19:36Z

@codex review

76b1223 also checks the declared end against each copy's largest, which counts datagrams.

(Written by Claude Opus 5.5)

chatgpt-codex-connector · 2026-10-22T21:22:41Z

Codex Review: Didn't find any major issues. More of your lovely PRs please.

Reviewed commit: 76b12239fe

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Resolve Recover::wants against #6251's delivery classification, keeping the returning-route reuse. Follow #6111's create_object and #6222's async clock advance in the tests, and retire the quest now that #6136 has landed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated and others added 2 commits October 20, 2026 18:37

quest: claim m1/resume-closed

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated marked this pull request as ready for review October 21, 2026 18:13

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fix(net): retain resume bounds across route copies #6224

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Merge origin/main into quest/m1/resume-closed

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kixelated and others added 2 commits October 21, 2026 22:41

Merge origin/main into quest/m1/resume-closed

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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kixelated added this pull request to the merge queue Oct 22, 2026

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quest: audit the tree against main (2026-10-22) #6273

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github-merge-queue Bot removed this pull request from the merge queue due to a conflict with the base branch Oct 22, 2026

This was referenced Oct 22, 2026

quest: plan the release audit's unowned follow-ups #6342

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chore(quest): plan Rust resume gaps from the failover audit #6365

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Merged via the queue into main with commit 1c72130 Oct 22, 2026
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kixelated deleted the quest/m1/resume-closed branch October 22, 2026 21:42

This was referenced Oct 22, 2026

test(interop): exercise real IETF control sessions #6306

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refactor(net)!: one with_range cursor setter #6138

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fix(net): keep a backup for a group read from a single route #6485

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kixelated commented Oct 21, 2026 •

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