For AI agents: the complete documentation index is available at /tc39-atlas/en/llms.txt, the full documentation bundle is available at /tc39-atlas/en/llms-full.txt, and this page is available as Markdown at /tc39-atlas/en/changes/quarter.md.
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    Reporting range: after Aug 4, 2026 through Nov 4, 2026 (inclusive), grouped by Asia/Shanghai daily update; data actually checked at Nov 4, 2026, 08:26 (Asia/Shanghai).

    DetectedChangeProposal
    Oct 16, 2026, 06:55Became inactiveRecord & Tuple
    Oct 16, 2026, 06:55AddedTime Zone Canonicalization
    Oct 16, 2026, 06:55Became inactiveWeakRefs cleanupSome
    Oct 16, 2026, 06:55Became inactiveSequence properties in Unicode property escapes
    Oct 16, 2026, 06:55Became inactiveRefCollection
    Oct 16, 2026, 06:55AddedClass fields, Private methods, and Static class features
    Oct 16, 2026, 06:55Became inactiveArrayBuffer.prototype.transfer
    Oct 16, 2026, 06:55Became inactiveGetting last element of Array
    Oct 16, 2026, 06:55Became inactiveUUID
    Oct 16, 2026, 06:55Became inactiveGeneric Comparison
    Oct 2, 2026, 07:43Stage changed: Stage 2.7 → Stage 3Curtailing the power of "Thenables"
    Oct 2, 2026, 07:43Stage changed: Stage 1 → Stage 2.7export all from
    Oct 2, 2026, 07:43Stage changed: Stage 2 → Stage 2.7Deferred Re-exports
    Oct 2, 2026, 07:43Stage changed: Stage 1 → Stage 2Bigint from exponential
    Oct 2, 2026, 07:43Stage changed: Stage 2 → Stage 2.7JSON.parse options
    Oct 2, 2026, 07:43Stage changed: Stage 1 → Stage 2Composites
    Oct 2, 2026, 07:43AddedAbort Controller
    Oct 1, 2026, 07:32Stage changed: Stage 3 → Stage 4Iterator Includes
    Oct 1, 2026, 07:32FinishedIterator Includes
    Oct 1, 2026, 07:32Stage changed: Stage 3 → Stage 4Iterator Join
    Oct 1, 2026, 07:32FinishedIterator Join
    Oct 1, 2026, 07:32Stage changed: Stage 3 → Stage 4iterator chunking
    Oct 1, 2026, 07:32Finishediterator chunking
    Sep 24, 2026, 06:45Stage changed: Stage 2 → Stage 2.7Curtailing the power of "Thenables"