---
# System prepended metadata

title: 79th meeting of TC39

---

# 79th meeting of TC39

- TCQ: https://tcq.app/meeting/0pdO
- Hallway track: https://hubs.mozilla.com/oAAvRHu/tc39
- Agenda: https://github.com/tc39/agendas/blob/master/2021/01.md
- Reflector: https://github.com/tc39/Reflector/issues/340

_see [below](#emoji-legend) for emoji legend_

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

<details open>
<summary>November 16th, 2020, 10:00 to 15:00 CET (UTC +1)</summary>

### 10:00-12:00

- Opening, welcome, housekeeping (Aki)
    - Introduce chairs, CoC, communication tools, IPR
    - Find volunteers for note taking
    - Next meeting date, time, logistics
    - Approval of the minutes from last meeting
    - Adoption of the agenda
- Plenary Scheduling (5m, Rob)
- Secretary's Report (15m, Istvan Sebestyen)
- ECMA262 Status Updates (15m)
- ECMA402 Status Updates (15m, Ujjwal)
- ECMA404 Status Updates (1m)
- Test262 Status Updates
- Updates from the CoC Committee (15m)
- Update on Chair Group for 2021 (5m, Rob)
- 15m	Handling of `NaN` and side effects in Date.prototype.set* methods	Kevin Gibbons
- 15m	Handling `await` in left operands of exponentiation	Daniel Rosenwasser, Kevin Gibbons
- 15m	`__proto__` normative optional options	Gus Caplan, Jordan Harband
- 15m	Re-resolve unresolvable bindings in PutValue	Shu-yu Guo
- 15m	IntegerIndexedElementSet should always indicate success	Kevin Gibbons


### lunch (60 minutes)

### 13:00-15:00

- 15m	Give %TypedArray% methods explicit algorithms	Ross Kirsling, Shu-yu Guo
- 60m	Vision for concurrent JS + constellations of proposals	Shu-yu Guo
- 45m	RegExp Matches Indices JSC Implementation feedback	Michael Saboff
- 20m	Supporting MDN's documentation about in TC39's output	Daniel Ehrenberg
</details>

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

<details>

<summary>

November 17th, 2020, 10:00 to 15:00 CET (UTC +1)

</summary>

### 10:00-12:00

- 15m	Default `constructors` and spread operations	Gus Caplan
- 30m	.item() rename + revisit inclusion on `String`	Shu-yu Guo 🔒⏰
- 25m	Standardized Debug for Stage 2	Gus Caplan 🔒⏰
- 30m	Import assertions status update	Sven Sauleau, Dan Clark and Daniel Ehrenberg



### lunch (60 minutes)

### 13:00-15:00
- 60m	Grouped Accessors and Auto-Accessors	Ron Buckton
- 60m	Realms for Stage 3, tentatively.	Leo Balter, Caridy Patiño 🔒⏰

</details>

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

<details>

<summary>

November 18th, 2020, 10:00 to 15:00 CET (UTC +1)

</summary>

### 10:00-12:00

- 30m	JSON modules for Stage 3	Sven Sauleau, Dan Clark and Daniel Ehrenberg 🔒⏰
- 60m	Tour of Temporal	Philip Chimento, Ujjwal Sharma 🔒📅
- 20m	Intl Enumeration API update	Frank Yung-Fong Tang

### lunch (60 minutes)

### 13:00-15:00

- 30m	JS Module Blocks	Surma 🔒📅⏰
- 30m	Process Update	Yulia Startsev
- 45m	⌛ Regex: Adopting Unicode behavior for multi-code-point character classes	Markus Scherer, Mathias Bynens 🔒⏰

</details>

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

<details open>

<summary>

November 19th, 2020, 10:00 to 15:00 CET (UTC +1)

</summary>

### 10:00-12:00

- 60m	Extensions for Stage 1	HE Shi-Jun 🔒📅
- 30m	Dealing with TC39 Data	Yulia Startsev 🔒⏰
- [up to] 15m	return to JSON modules for Stage 3	Sven Sauleau, Dan Clark and Daniel Ehrenberg 🔒📅

### lunch (60 minutes)

### 13:00-15:00

- 10m	Revisit Supporting MDN's documentation about in TC39's output	Daniel Ehrenberg
- [up to] 15m	revisiting Grouped Accessors and Auto-Accessors	Ron Buckton
- 25m	Error Cause for Stage 2	Chengzhong Wu and Hemanth HM
- 10m	Incubator call chartering	shu
- 60m	Batch preloading and JavaScript	Daniel Ehrenberg 🔒📅⏰

</details>

***

## Overflow

### From agenda

### Timebox overrun

- ☑️	Revisit Supporting MDN's documentation about in TC39's output	Daniel Ehrenberg
- ☑️	Revisit JSON modules for Stage 3	Sven Sauleau, Dan Clark and Daniel Ehrenberg 🔒⏰
- ◻️	Revisit Grouped Accessors and Auto-Accessors	Ron Buckton


## Schedule constraints

- ☑️ Surma is available on Wednesday, November 18 only.
- ☑️ Temporal preferred to be Wednesday or Thursday.
- ☑️ Jordan is available the first two hours of each day, and would like to be present for: .item (specifically re string inclusion), JSON modules, standardized debug, and "TC39 Data".
- ☑️ Batch preloading is preferred to be discussed on Wednesday or Thursday as the last item of the day.
- ☑️ Hax requested to present Vision for concurrent JS on day 3 or 4
- ☑️ Leo requested realms remain as the last hour of the day so he can get his coworkers to join
- ☑️ Shane Carr requested on behalf of Markus that Regex: Adopting Unicode behavior be presented at the end of the day



## emoji legend

_note: this is mostly intended to be information for chairs in the scheduling and re-arrangement process_

- ☑️ - schedule constraints are currently met (remove if schedule changes must be made)
- 🔒 - agenda item is placed intentionally to accomodate schedule constraints
- 📅 - agenda item is constrained by day
- ⏰ - agenda item is constrained by time
- ⏳ - agenda item added after deadline

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