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Agenda for the 103rd meeting of Ecma TC39

  • Host: Remote
  • Dates and times:
    • 10:00 to 15:00 PDT (America/Los_Angeles) on 29 July 2024
    • 10:00 to 15:00 PDT (America/Los_Angeles) on 30 July 2024
    • 10:00 to 15:00 PDT (America/Los_Angeles) on 31 July 2024
    • 10:00 to 15:00 PDT (America/Los_Angeles) on 1 August 2024
  • Attendee information: https://github.com/tc39/Reflector/issues/536
gantt
  1 month before the meeting: milestone, 2024-06-29 10:00+0800, 1m
  Proposal advancement deadline: milestone, 2024-07-19 10:00+0800, 1m
  Schedule constraint deadline: milestone, 2024-07-26 10:00+0800, 1m
  Day 1 : day1, 2024-07-29 10:00+0000, 7h
  Day 2 : day2, 2024-07-30 10:00+0000, 7h
  Day 3 : day3, 2024-07-31 10:00+0000, 7h
  Day 4 : day4, 2024-08-01 10:00+0000, 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('2024-07-29T10:00[America/Los_Angeles]')
  .withTimeZone(Temporal.Now.timeZoneId()) // your time zone
  .toLocaleString()

Background:

Agenda topic rules

Deadline for advancement eligibility: July 19th, 10:00 PDT

  • 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 (2m, 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, Samina Husain) (slides)

  7. Project Editors’ Reports

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

  8. Task Group Reports

    1. TG3: Security (5m)
    2. TG4: Source Maps (5m)
    3. TG5: Experiments in Programming Language Standardization (5m, Mikhail Barash) (slides)

  9. Updates from the CoC Committee (5m)

  10. Web compatibility issues / Needs Consensus PRs

    timebox topic presenter
    10m Intl.DurationFormat: Display negative sign on leading numeric-style zeroes (PR) (slides) Ben Allen
    20m Normative: fully define Math.sqrt (PR), part of tighter constraints on implementation-approximated values Michael Ficarra and Dan Gohman
    20m Normative Conventions: pretend primitives aren't iterable (PR) Michael Ficarra
    30m Avoid capturing lexical context in indirect eval (PR, slides) Nicolò Ribaudo
    30m Propagate active ScriptOrModule with JobCallback Record (PR) (slides) Chengzhong Wu
    30m Normative: Add text about locale installation in browser implementations as fingerprinting vector (PR/Discussion) (slides) Ben Allen
    30m Normative: Make DefaultNumberOption in ECMA-402 truncate options before validating range (PR) (slides) Ben Allen
    60m tc39/Reflector#535 Michael Ficarra

  11. Overflow from previous meeting

    timebox topic presenter

  12. Short (≤30m) Timeboxed Discussions

    timebox topic presenter

  13. Proposals

    stage timebox topic presenter
    3 5m Source phase imports update (slides) Luca Casonato
    3 10m Drop assert from import attributes (PR) Nicolò Ribaudo
    3 30m Intl Locale Info Update in Stage 3 (slides) Frank Yung-Fong Tang
    3 30m Temporal update & bug fixes (slides) Philip Chimento
    2.7 15m Atomics.pause for Stage 3 Shu-yu Guo
    2.7 15m RegExp.escape for stage 3 Jordan Harband
    2.7 30m Joint Iteration naming discussion issue 27 Ashley Claymore and Michael Ficarra
    2 15m Error.isError for stage 2.7 Jordan Harband
    2 30m Array.isTemplateObject for Stage 2.7 (slides) Daniel Ehrenberg and Jordan Harband
    2 45m AsyncContext update (slides) Chengzhong Wu and Andreu Botella
    1 30m Decimal for Stage 2 (slides) Jesse Alama
    0 45m concurrency control for Stage 1 (slides) Michael Ficarra and Luca Casonato
    0 45m unordered async iterator helpers for Stage 1 (slides) Michael Ficarra

  14. Longer or open-ended discussions

    timebox topic presenter
    30m Scrub of Stage 2 proposals Peter Klecha
    45m ⌛ Updates from TypeScript: deferred and immediate (slides) Daniel Rosenwasser

  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

  • concurrency control should be discussed prior to unordered async iterator helpers because the latter has a dependency on the former
  • Ron Buckton will not be able to attend after noon (PST) on July 30th nor the entirety of July 31st, but would like to be present for Atomics.pause, "concurrency control", "Async Context", and "Scrub of Stage 2 proposals", and "pretend primitives aren't iterable", in order of precedence.
  • Andreu Botella would prefer not to present Async Context after 1 PM (PST) on July 31st or August 1st. They have no constraints on July 29 or 30th.
  • Frank Yung-Fong Tang is only available to present 10:00 to 15:00 PDT (America/Los_Angeles) on 30 July 2024.
  • Michael Ficarra cannot present during the first hour of the meeting on Wednesday.

Late-breaking Schedule Constraints

  • Philip Chimento is not available Monday 29 July 11:45-14:00. (This doesn't affect anything currently planned.)
  • Peter Klecha cannot present on July 31st.