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Ecma logo

Agenda for the 104th meeting of Ecma TC39

  • Host: Sony Interactive Entertainment
  • Dates and times:
    • 10:00 to 17:30 JST (Asia/Tokyo) on 8 October 2024
    • 10:00 to 17:30 JST (Asia/Tokyo) on 9 October 2024
    • 10:00 to 17:00 JST (Asia/Tokyo) on 10 October 2024
  • Location: Tokyo, Japan
  • Attendee information: https://github.com/tc39/Reflector/issues/537
gantt
  1 month before the meeting: milestone, 2024-09-08 10:00+0900, 1m
  Proposal advancement deadline: milestone, 2024-09-28 10:00+0900, 1m
  Schedule constraint deadline: milestone, 2024-10-06 10:00+0900, 1m
  Day 1 : day1, 2024-10-08 10:00+0900, 7h
  Day 2 : day2, 2024-10-09 10:00+0900, 7h
  Day 3 : day3, 2024-10-10 10:00+0900, 7h
  todayMarker stroke-width:5px,stroke:#0f0,opacity:0.5
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For meeting times in your timezone, visit Temporal docs and run the code below in the devtools console.

Temporal.ZonedDateTime.from('2024-10-08T10:00[Asia/Tokyo]')
  .withTimeZone(Temporal.Now.timeZoneId()) // your time zone
  .toLocaleString()

Background:

Agenda topic rules

Deadline for advancement eligibility: September 28th, 10:00 JST

  • Note: this time is selected to be precisely 10 days prior to the start of the meeting
  1. Proposals not looking to advance may be added at any time; if after the deadline, please always use a pull request so that members are notified of changes. Note: an unmerged PR counts as “added” for the purposes of this requirement.
  2. Proposals seeking feedback at stage 0 must be added (and noted as such) prior to the deadline, or else delegates may object to advancement solely on the basis of missing the deadline.
    1. Such proposals should include supporting materials when possible.
  3. Proposals looking to advance to stage 1 must be added (and noted as such) prior to the deadline, or else delegates may object to advancement solely on the basis of missing the deadline.
    1. Such proposals must link to a proposal repository and they should link to supporting materials when possible.
  4. Proposals looking to advance to stages 2, 2.7, 3, or 4, as well as other normative changes to the standard or proposals in stage 3 or later looking to achieve consensus, must be added (and noted as such) along with links to the supporting materials prior to the deadline, or else delegates may withhold consensus for advancement solely on the basis of missing the deadline.
    1. If the supporting materials change substantially after the deadline, delegates may withhold consensus for advancement, based on the committee’s judgment.
    2. For urgent normative changes, the committee is expected to be more forgiving of a missed deadline, since there is generally less material to review than in a stage advancement.
    3. Proposals looking to advance to stage 4 must link to a pull request into the spec, since the process requires one.
  5. Proposal-based agenda items should be sorted primarily by stage (descending), secondarily by timebox (ascending), and finally by insertion date.

Supporting materials includes slides, a link to the proposal repository, a link to spec text, etc.; essentially, anything you are planning to present to the committee, or that would be useful for delegates to review.

Agenda key

When applicable, use these emoji as a prefix to the agenda item topic.

Emoji Meaning
❄️ hard schedule constraints apply to this agenda item (e.g. presenter)
🔒 schedule constraints apply to this agenda item
⌛️ late addition for stage advancement and/or schedule prioritization
🔁 continuation of a previous agenda item

Agenda items

  1. Opening, welcome and roll call (Chair)

    1. Opening of the meeting
    2. TC39 follows its Code of Conduct
    3. Introduction of attendees
    4. Host facilities, local logistics
    5. Quick recap of meeting IPR policy
    6. Overview of communication tools
    7. Reminder to review Github Delegate teams (Jordan Harband)
    8. TC39 stenography support and legal disclaimer

  2. Find volunteers for note taking

  3. Adoption of the agenda

  4. Approval of the minutes from last meeting

  5. Next meeting host and logistics

  6. Secretary's Report (15m, Aki Braun) (slides)

  7. Project Editors’ Reports

    1. ECMA262 Status Updates (Shu-yu Guo) (slides) (10m)
    2. ECMA402 Status Updates (slides)(15m)
    3. ECMA404 Status Updates (15m)
    4. Test262 Status Updates (15m)

  8. Task Group Reports

    1. TG3: Security (5m)
    2. TG4: Source Map Specification, 2024 edition approval (30m, Jonathan Kuperman) (slides)
    3. TG5: Experiments in Programming Language Standardization (5m)

  9. Updates from the CoC Committee (5m)

  10. Web compatibility issues / Needs Consensus PRs

    timebox topic presenter
    5m Make toSorted methods stable Kevin Gibbons
    5m Normative: Fix bug with RelativeTimeFormat and DateTimeFormat not correctly passing "numberingSystem" option to NumberFormat, (slides) Ben Allen
    5m Normative: Explicitly designate sort order for plural categories returned by Intl.PluralRules.prototype.resolvedOptions, (slides) Ben Allen
    5m Normative: When formatting currency values, only use data on the number of minor units used to display that currency when using standard notation, (slides) Ben Allen
    15m Normative: Allow use of non-ISO 4217 data in CurrencyDigits AO, (slides) Ben Allen
    15m ArrayBuffer construction step order Richard Gibson
    30m #3385 Shu-yu Guo

  11. Overflow from previous meeting

    timebox topic presenter

  12. Short (≤30m) Timeboxed Discussions

    timebox topic presenter
    20m Exploring an Idea of a Proposal Management and Technical Arbitration Tool Mikhail Barash
    30m Explicit compile hints (slides, explainer, spec draft) Marja Hölttä
    30m Porffor JS engine - Compiling JS ahead-of-time Oliver Medhurst

  13. Proposals

    stage timebox topic presenter
    3 5m Source phase imports error type change (PR, slides) Guy Bedford
    3 5m Intl.DurationFormat do not include grouping separators in numeric-like styles (PR), (slides) Ben Allen
    3 10m Temporal progress update Philip Chimento
    3 10m Regular Expression Modifiers and Needs Consensus PR for Stage 4 (PR, slides) Ron Buckton
    3 10-15m iterator helpers for Stage 4 (PR, slides) Michael Ficarra
    3 15m Promise.try for Stage 4 (PR) Jordan Harband
    3 5m Import Attributes and JSON modules for stage 4 (tc39/ecma262#3057, tc39/ecma262#3391) Nicolò Ribaudo
    2.7 15m Math.sumPrecise for stage 3 & last chance to suggest other names (tests) Kevin Gibbons
    2.7 30m import defer updates regarding evaluation triggers (slides) Nicolò Ribaudo
    2.7 45m Atomics.pause for stage 3 (spec) Shu-yu Guo
    2 15m AsyncContext updates (Slides) Andreu Botella
    2 20m Error.isError for stage 2.7 Jordan Harband
    2 30m Map.emplace stage 2 update (Slides) Daniel Minor
    2 30m Proposal ESM Phase Imports update (slides) Guy Bedford
    2 30m Discard (void) Bindings update (spec, slides) Ron Buckton
    2 20-45m iterator sequencing for Stage 2.7 (spec, slides) Michael Ficarra
    1 20m Restricting subclassing support in built-in methods: Telemetry Results (Firefox) Update, slides Yulia Startsev & Matthew Gaudet
    1 20m Smart Units stage 1 update Ben Allen
    1 10-30m iterator chunking for Stage 2 (spec, slides) Michael Ficarra
    1 60m Structs and shared structs for stage 2 (spec, slides) Shu-yu Guo, Ron Buckton
    1 60m DataView get/set Uint8Clamped methods for stage 2 Jordan Harband
    1 60m Decimal stage 1 update (slides) Jesse Alama & Nicolò Ribaudo
    1 60m Extractors for Stage 2 (spec, slides) Ron Buckton
    -1 30m Array.zip for stage 1, or 2, or 2.7 Jordan Harband
    - 30m Measure object stage 0 Ben Allen
    - 60m Immutable ArrayBuffers for Stage 1 (spec, Keynote slides, pdf slides) Mark S. Miller

  14. Longer or open-ended discussions

    timebox topic presenter
    45m 🔒 WHATWG Observables Dominic Farolino
    90m JSSugar/JS0 (slides) Shu-yu Guo

  15. Overflow from timeboxed agenda items (in insertion order)

    topic presenter

  16. Incubation call chartering (15m on the last day)

  17. Other business

    1. Thank host

  18. Adjournment

Schedule constraints

Schedule constraints should be supplied here as soon as possible, and at least three days before the meeting begins so that the Chairs can take them into account when preparing the schedule.

Normal Constraints

  • Daniel Minor can only present Map.emplace before 1pm JST, and would like to attend "JSSugar/JS0" with the same time constraint.

  • Dominic Farolino can only present the Observable API between 10am JST and 1pm JST, either Tuesday the 8th, or Wednesday the 9th.

  • Nicolò Ribaudo prefers to present in the afternoons, and prefers the JSSugar discussion to happen on the last day.

  • Guy Bedford is available to present before 2pm JST any day, with a preference for 1pm - 2pm JST

  • Peter Hoddie would like to attend "Immutable ArrayBuffers", "JSSugar/JS0", and "DataView get/set Uint8Clamped methods" but is only available before 1pm JST (all days).

  • Kevin Gibbons is only available before 3pm JST and would weakly like to attend the Shared Structs item, though if it proves impossible to accomodate this in addition to everyone else's constraints it's fine.

  • Shu-yu Guo would like to present Shared Structs before JSSugar/JS0. No absolute time constraints, just relative. The two items don't need to be consecutive or anything, just relatively ordered.

  • Mathieu Hofman would like to be present for Shared Structs and the Eval Twin discussion, but is not available Wed 9.

  • The Temporal champions would prefer to schedule the 10-minute Temporal update early in the Tokyo day, but we're flexible about which day and what time.

  • Ryan Hunt is only available before 1pm JST and would like to attend the Shared Structs item. It's okay if that is not possible.

Late-breaking Schedule Constraints