---
# System prepended metadata

title: 82nd meeting of TC39

---

# 82nd meeting of TC39

- TCQ: https://tcq.app/meeting/4xJ3
- Hallway track: https://hubs.mozilla.com/oAAvRHu/tc39
- Agenda: https://github.com/tc39/agendas/blob/master/2021/04.md
- Reflector: https://github.com/tc39/Reflector/issues/354

## Day 1 ([notes](https://mths.be/tc39day1))

<details>

<summary>10:00 to 15:00 EDT (UTC -4) on Monday, 19 April</summary>

### 10:00-12:00

- Opening & Welcome - Aki
- Volunteers for note-taking
- Adoption of the agenda
- Approval of the minutes from last meeting
- Secretary's Report
- ECMA262 Status Updates
- ECMA402 Status Updates
- ECMA404 Status Updates
- Test262 Status Updates
- Updates from the CoC Committee
- 1m | Temporal update: Normative changes upon which Stage 3 was conditional, have been resolved. EOM | Philip Chimento
- 30m | chartering of the security TG | TC39 chair group
- 30m ⏰📅 | ⌛ Intl.NumberFormat V3 Stage 2 Update | Shane F. Carr

### lunch (60 minutes)

### 13:00-15:00

- 1h | Class fields, private methods, and static class features for Stage 4 | Caio Lima
- 30m | Import Assertions update | Myles Borins, Daniel Ehrenberg, Sven Sauleau, Daniel Clark
- 20m | Requests for services from Ecma for TC39 | Daniel Ehrenberg

</details>

## Day 2 ([notes](https://mths.be/tc39day2))

<details>

<summary>10:00 to 15:00 EDT (UTC -4) on Tuesday, 20 April</summary>

### 10:00-12:00

- 30m ⏰📅 | Intl Locale Info for Stage 3 | Frank Yung-Fong Tang
- 30m ⏰📅 | Intl DisplayNames v2 for Stage 3 | Frank Yung-Fong Tang
- 30m ⏰📅 | RegExp Unicode set notation + properties of strings update | Mathias Bynens
- 30m ⏰📅 | Extend TimeZoneName Option Proposal for Stage 2 | Frank Yung-Fong Tang

### lunch (60 minutes)

### 13:00-15:00

- 45m | ResizableArrayBuffer for Stage 3 | Shu-yu Guo
- 20m | Change Array by copy for Stage 1 | Robin Ricard
- 20m | `Object.has` for Stage 1 | Tierney Cyren
- 30m | Pattern matching update | Mark Cohen

</details>

## Day 3 ([notes](https://mths.be/tc39day3))

<details open>

<summary>10:00 to 15:00 EDT (UTC -4) on Wednesday, 21 April</summary>

### 10:00-12:00

- 30m ⏰📅 | Move test262 requirement to Stage 3 | Gus Caplan
- 15m | NVC Training Proposal | TBD
- 40m ⏰📅 | Read-only ArrayBuffer and Fixed view of ArrayBuffer for Stage 1 | Jack Works
- 30m ⏰📅 | Intl Enumeration API update | Frank Yung-Fong Tang
- (five minutes extra)

### lunch (60 minutes)

### 13:00-15:00

- 90m ⏰📅 | Isolated Realms update | Leo Balter, Caridy Patiño
- 30m ⏰📅 | Symbols as WeakMap keys for Stage 2 | Leo Balter, Caridy Patiño, Daniel Ehrenberg
- 5m | Incubation call chartering | Shu-Yu Go

</details>

## Day 4 ([notes](https://mths.be/tc39day4))

<details open>

<summary>10:00 to 15:00 EDT (UTC -4) on Thursday, 22 April</summary>

### 10:00-12:00

- **2 _hours_ extra time**

### lunch (60 minutes)

### 13:00-15:00

- **2 _hours_ extra time**

</details>

***

## Overflow

### From agenda

N/A

### Timebox overrun

#### ResizableArrayBuffer for Stage 3 - Shu-yu Guo (@google)

- Current Topic: Explanation of reservations with global constructors - Peter Hoddie (Moddable)
- Queue
    - Reply: Feel that the request for more time is appropriate here - yulia (@mozilla)
    - New Topic: I was concerned about Wasm integration in the past and I’m very happy with the proposal here - Daniel Ehrenberg (Igalia)
    - New Topic: Global per compartment - Mark S. Miller (@Agoric )

#### Move test262 requirement to Stage 3 - devsnek @OpenJS-Foundation

- Current Topic: What I want as an implementer - Shu-yu Guo (@google)
- Queue:
	- Reply: what’s the status of “implementation contributed” in test262? - devsnek (@OpenJS-Foundation)
	- New Topic: This is a project management problem, not a stage process problem - Shane F. Carr (Google)
	- New Topic: If we request test262 test before reaching stage 3, then test262 need to accept test which may not align with what eventually accept into stage 3 and therefore the day after we may have mixed of CORRECT test and INCORRECT test and make the impl more difficult - Frank Yung-Fong Tang (Google)
	- New Topic: Reply about discrepancy between polyfills and spec - Philip Chimento

## Schedule constraints

- Leo Balter and Caridy Patiño are not available on Thursday, April 22nd. Best time ranges are Monday and Wednesday after lunch. Please avoid Tuesday after lunch, TIA!
- Gus Caplan will not be available to present after 1:00PM ET on any day.
- Frank Yung-Fong Tang and Shane F. Carr will not be available 12:30-14:00 PM ET on Tuesday April 20th nor after 1:30PM ET on Wednesday April 21st.
- Shane F. Carr is unavailable Thursday after 13:00 ET; wants to be present for all Intl- and Regex-related topics.
- Please schedule NVC Training Proposal after "Requests for services from Ecma for TC39"
- Please schedule the “set notation + properties of strings update” somewhere within 12:00–14:00 ET on Thursday April 22nd so both champions and all stakeholders can attend.
- It's better to put Jack Works' agenda item at first 2 hours of the day, or any time before the Isolated Realms update presented.

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