Issue #17138 has been updated by fatkodima (Dima Fatko).


* [Feature #14394] Class.descendants (fatkodima)
  * Introduces `Module#descendants` method as a native way to track `Class`/`Module` descendants, instead of inefficient hack like crawling `ObjectSpace` or tracking descendants via `inherited` hook. MRI already tracks subclasses, so this won't introduce new overheads.
 
* [Feature #17056] Array#index: Allow specifying the position to start search as in String#index (fatkodima)
  * If we know from which offset to start searching, this will potentially speed up the index findings.

* [Bug/Feature #17030] Enumerable#grep{_v} should be optimized for Regexp (fatkodima)
  * From this issue, it was decided to add a new `/f` ("fast", the name is debatable) option to regexps. 
  * When provided, the methods which previously allocated global `MatchData` objects, won't do that anymore. This will reduce memory usage overall and greatly sped things up. The benchmark results are provided in the ticket.    

* [Feature #15573] Permit zero step in Numeric#step and Range#step (fatkodima)
  * This is for consistency with other behavior. The ticket description describes the problem. Matz responded there that, and I implemented a patch and chose to raise an error on zero step. 

* [Feature #13683] Add strict Enumerable#single (fatkodima)
  * This method will ensure the collection contains only one element and return it. This feature is useful and there are many +1 on that.
  * The name for this method (`single`, `one`, `only`) is under discussion
  * Should this method accept a default (like `Hash#fetch`) when collection is empty, and how: default arg vs block? 

----------------------------------------
Misc #17138: DevelopersMeeting20200925Japan
https://bugs.ruby-lang.org/issues/17138#change-87506

* Author: mame (Yusuke Endoh)
* Status: Open
* Priority: Normal
----------------------------------------
# The next dev meeting

**Date: 2020/09/25 13:00-17:00**
Place/Sign-up/Agenda/Log: *TBD*

- Dev meeting *IS NOT* a decision-making place. All decisions should be done at the bug tracker.
- Dev meeting is a place we can ask Matz, nobu, nurse and other developers directly.
- Matz is a very busy person. Take this opportunity to ask him. If you can not attend, other attendees can ask instead of you (if attendees can understand your issue).
- We will write a log about the discussion to a file or to each ticket in English.
- All activities are best-effort (keep in mind that most of us are volunteer developers).
- The date, time and place are scheduled according to when/where we can reserve Matz's time.
- *DO NOT* discuss then on this ticket, please.

# Call for agenda items

If you have a ticket that you want matz and committers to discuss, please post it into this ticket in the following format:

```
* [Ticket ref] Ticket title (your name)
  * Comment (A summary of the ticket, why you put this ticket here, what point should be discussed, etc.)
```

Example:

```
* [Feature #14609] `Kernel#p` without args shows the receiver (ko1)
  * I feel this feature is very useful and some people say :+1: so let discuss this feature.
```

- Comment deadline: 2020/09/18 (one week before the meeting)
- The format is strict.  We'll use [this script to automatically create an markdown-style agenda](https://gist.github.com/mame/b0390509ce1491b43610b9ebb665eb86).  We may ignore a comment that does not follow the format.
- Your comment is mandatory.  We cannot read all discussion of the ticket in a limited time.




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