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Agenda for the 77th meeting of Ecma TC39

  • Host: Microsoft
  • Dates and times:
    • 10:00 to 15:00 PT (UTC -7) on July 20th, 2020
    • 10:00 to 15:00 PT (UTC -7) on July 21st, 2020
    • 10:00 to 15:00 PT (UTC -7) on July 22nd, 2020
    • 10:00 to 15:00 PT (UTC -7) on July 23rd, 2020
  • Location: Remote (was Redmond)
  • Attendee information: https://github.com/tc39/Reflector/issues/288

Allen's paper on standards committee participation for new attendees: http://wirfs-brock.com/allen/files/papers/standpats-asianplop2016.pdf

Agenda topic rules

Deadline for advancement eligibility: July 10th, 2020, 10:00 PT

  • 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.
  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, 3, or 4 must be added (and noted as such) along with the necessary materials 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 supporting materials prior to the deadline, or else delegates may object to advancement solely on the basis of missing the deadline. If these materials change substantially after the deadline, the proposal may be disqualified from advancement, based on the committee’s judgment.
    2. 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 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

  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, Istvan Sebestyen, slides (https://github.com/tc39/agendas/blob/HEAD/2020/tc39-2020-036.pdf))

  7. Project Editors’ Reports

    1. ECMA262 Status Updates (15m, slides)
    2. ECMA402 Status Updates (15m, slides)
    3. ECMA404 Status Updates (15m)
    4. Test262 Status Updates (15m, slides)

  8. Updates from the CoC Committee (15m)

  9. Web compatibility issues / Needs Consensus PRs

    ✓ timebox topic presenter
    ✓ 10m retroactive consensus on Unicode 13 property names and aliases (#1896, #1939) Michael Ficarra
    ✓ 15m Specify \8 and \9 in sloppy (non-template) strings (#2054) Ross Kirsling
    ✓ 15m adding Reflect[Symbol.toStringTag] (#2057) Jordan Harband
    ✓ 15m Should eval?.() be direct eval? (#2062, #2063) Ross Kirsling
    ✓ 15m Host hooks for Job callbacks (slides) Shu-yu Guo
    ✓ 15m Handle awkward rounding behavior (slides) Ujjwal Sharma
    ✓ 15m ⌛ Strictness check for object's SetMutableBinding (slides) Leo Balter
    ✓ 30m fix Function toString for builtins Gus Caplan, Jordan Harband

  10. Overflow from previous meeting

    ✓ timebox topic presenter
    ✓ 45m Cognitive Dimensions of Notation: a framework for reflecting on language design Yulia Startsev and Felienne Hermans

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

  12. Short (≤30m) Timeboxed Discussions

    ✓ timebox topic presenter

  13. Proposals

    ✓ represents an agenda item which has been presented, and does not indicate stage advancement

✓ stage timebox topic presenter
✓ 3 5m NumericLiteralSeparator for Stage 4 (slides) Rick Waldron, Sam Goto, Leo Balter
✓ 3 10m Intl.ListFormat for Stage 4 (slides) Zibi Braniecki
✓ 3 10m Intl.DateTimeFormat dateStyle/timeStyle for Stage 4 (slides) Zibi Braniecki
✓ 3 15m Promise.any & AggregateError for stage 4 (slides) (PR) Mathias Bynens
✓ 3 15m WeakRefs for Stage 4 (PR) and CleanupSome for stage 2/3 (slides) Daniel Ehrenberg, Yulia Startsev
✓ 3 15m Logical Assignment for Stage 4 (PR, slides) Justin Ridgewell
✓ 2 10m Decorators status update (slides) Kristen Hewell Garrett
✓ 2 15m Ergonomic brand checks for private fields for stage 3 (issue) Jordan Harband
✓ 2 15m Temporal Stage 2 update (slides) Philip Chimento
✓ 2 30m Intl.Segmenter for Stage 3 (slides, spec text) Richard Gibson
✓ 2 45m Import Conditions for Stage 3 (slides, spec text) Sven Sauleau, Daniel Ehrenberg, Myles Borins, Dan Clark, Shu-yu Guo
✓ 2 45m Upsert (now renamed emplace) updates & for Stage 3 (slides) Bradley Farias
✓ 2 15m Iterator Helpers update (slides) Adam Vandodler
✓ 1 15m .item() for Stage 2 (slides) Shu-yu Guo, Tab Atkins
✓ 1 20m Number.range for Stage 2 (spec, slides) Jack Works
✓ 1 20m Slice notation for Stage 2 (spec, slides) Sathya Gunasekaran
1 30m Numeric literal suffixes update: separate namespace version (slides) Daniel Ehrenberg
✓ 1 30m Record and Tuple for Stage 2 (spec, slides) Robin Ricard & Rick Button
✓ 1 30m Symbol as WeakMap key for Stage 2 (spec, slides) Daniel Ehrenberg
✓ 1 30m JSON.parse source text access for Stage 2 (slides, spec text) Richard Gibson
✓ 1 30m ⌛ Class static blocks for Stage 2 (spec, slides) Ron Buckton & Daniel Rosenwasser
✓ 0 15m await operations for Stage 1 (spec, slides) Jack Works
✓ 0 15m Array.prototype.unique() proposal for Stage 1 (slides) @TechQuery (presented by Jack Works)
✓ 0 15m Forbid Numeric Separators in NonOctalDecimalIntegerLiteral fractional / exponent parts, original issue, slides Leo Balter, Ross Kirsling
✓ 0 15m Arbitrary Module Namespace Identifiers update & for Stage 1 Bradley Farias
✓ 0 45m ResizableArrayBuffer and GrowableSharedArrayBuffer for Stage 1 (slides) Shu-yu Guo
✓ 0 45m Async Context updates & for Stage 1 (slides) Chengzhong Wu

  1. Longer or open-ended discussions

    ✓ timebox topic presenter
    ✓ 15m Flex Incubator Calls to weekly meetings Leo Balter
    ✓ 30m Documenting Invariants, (repo, slides) Yulia Startsev
    ✓ 30m Many specific invariants to consider (slides) Mark S. Miller
    ✓ 15m Addressing institutional racism in TC39 (issue, slides) Mark Cohen
    30m Operator overloading: a good direction for JS? Daniel Ehrenberg

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

    ✓ topic presenter

  3. Other business

    1. Thank host

  4. Adjournment

Schedule constraints

  • Mathias is only available on July 21st from 10:00 to 11:00 PT (UTC -7) — could we schedule the Promise.any & AggregateError item then?
  • Philip Chimento (Temporal) only available Monday and Tuesday.
  • Felienne Hermans (Cognitive Dimensions of Notation) only available Monday. Preferably earlier.
  • Documenting Invariants talk should happen before discussion of Specific Invariant Topics.
  • Ron Buckton will only be available on July 20th, will only have very limited availability July 21st-22nd, and will not be available July 23rd. If necessary, Daniel Rosenwasser will present in my place.
  • "Addressing institutional racism" would prefer to present on Thursday (July 23).
  • Records and Tuples should be scheduled adjacently to Symbols as WeakMap keys.
  • Sven Sauleau (Import Conditions) not available Monday.

Presentations which can be deferred

The schedule is overfull and we won't be able to get to everything. In this section, TC39 delegates can volunteer to defer their own presentation to a future meeting.

  • Daniel Ehrenberg: Operator overloading, and if necessary, extensible numeric literals.

Dates and locations of future meetings

Dates Location Host
2020-09-21 to 2020-09-24 Remote (was Tokyo, Japan) Bloomberg
2020-11-16 to 2020-11-19 Remote (was Budapest, Hungary) IBM