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/month.md.
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      Reporting range: after Oct 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