Misc #19429: DevMeeting-2023-03-09

• Status: Closed
• Assignee: -

[mame (Yusuke Endoh)]

The next dev meeting

Date: 2023/03/09 13:00-17:00 (JST)
Log: https://github.com/ruby/dev-meeting-log/blob/master/2023/DevMeeting-2023-03-09.md

• 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 record of the discussion in the 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 of the meeting 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.

• It is recommended to add a comment by 2023/03/06. We hold a preparatory meeting to create an agenda a few days before the dev-meeting.
• The format is strict. We'll use this script to automatically create an markdown-style agenda. 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. We appreciate it if you could write a short summary and update from a previous discussion.

[mame (Yusuke Endoh)]

• Related to Misc #14770: [META] DevelopersMeeting added

[sawa (Tsuyoshi Sawada)]

• [Feature #10343] Postfix notations for when and else inside case statement (sawa)
  • Allow foo when condition within case-statements.
  • Has not received feedback for eight years.

[zverok (Victor Shepelev)]

• [Bug #19362] #dup on Proc doesn't call initialize_dup (zverok)
  • The fact that initialize_dup is not called by Proc#dup is inconsistent, and there are no docs confirming it is deliberate. @nobu's PR shows it is possible to fix.

[byroot (Jean Boussier)]

• [Feature #19435] Expose counts for each GC reason in GC.stat
  • Add 8 new keys in GC.stat.
  • We used that patch in production to fix GC issues we had, we believe these counters to be high value.
  • The only way to get this information today is to compile with debug counters, which isn't very suitable.

[AMomchilov (Alexander Momchilov)]

• [Feature #19197] Add Exception#root_cause (AMomchilov)
  • It returns the last exception in linked-list of causality chain, that is, the original exception (whose own cause is nil).

[Eregon (Benoit Daloze)]

• [Feature #19440] Deprecate ThreadGroup (eregon)
  • Thoughts?
  • If disagree, how do we put the Timeout thread in the default ThreadGroup? It seems impossible with current API.

[byroot (Jean Boussier)]

• [Bug #19436] Call Cache for singleton methods can lead to "memory leaks" (byroot)
  • When caching a singleton method call, the receiver becomes immortal until that call cache is updated.
  • On large apps with some infrequently called codepaths this can lead to very large objects graphs not being collected.
  • The reference chain is IMEMO(callcache) -> IMEMO(ment) -> ICLASS -> CLASS(singleton) -> OBJECT
  • I explored 3 solutions
    • Only keep a weak reference to the CME
    • Don't cache singleton method calls (unless it's a Class or Module singleton)
    • Make Class#attached_object a weak reference
  • I'd like to get opinions on which solution would be preferable.

[eightbitraptor (Matt V-H)]

• [Feature #19406] Allow declarative reference definition for rb_typed_data_struct (eightbitraptor)
  • This is essentially a simpler interface for handling marking/compaction for rb_typed_data_struct that hold references to other Ruby objects than the existing dmark/dcompact callback interface.
  • It's useful in non-complex cases where the object just holds simple reference. Is this enough for it to have value?

[peterzhu2118 (Peter Zhu)]

• [Feature #19437] Add marking and sweeping time to GC.stat (peterzhu2118)
  • This feature records GC time in marking and sweeping phases and exposed them via a marking_time and sweeping_time key in GC.stat.
  • This feature will allow us to know the proportion of time spent in each phase of GC to help us better tune the GC.
  • This means that GC.stat(:time) == GC.stat(:marking_time) + GC.stat(:sweeping_time).

[ioquatix (Samuel Williams)]

• [Feature #19450] Is there an official way to set a class name without setting a constant?
  • Do we accept Class.new(superclass, name) and Module.new(name) syntax?
• [Feature #19451] Extract path and line number from SyntaxError?
  • Can we introduce SyntaxError#column or similar interface?
• [Feature #19452] Thread::Backtrace::Location should have column information if possible.
  • Can we introduce Thread::Backtrace::Location#column or similar interface?
• [Feature #19094] sleep(nil) vs sleep() and replicating the default implementation.
  • Do we accept sleep(nil) is equivalent to sleep()?

[jeremyevans0 (Jeremy Evans)]

• [Bug #19455] Ruby 3.2: wrong Regexp encoding with non-ASCII comments (jeremyevans0)
  • Is using US-ASCII encoding for such regexps a bug? Since the regexp itself does not use non-ASCII, it seems reasonable to use ASCII encoding for the regexp.
  • For such regexps, even if the regexp itself is US-ASCII, should the source still be UTF-8, since the source contains non-ASCII characters?
  • Are there issues if the regexp encoding does not match the source encoding, because the non-ASCII characters are in comments?
• [Bug #19417] Regexp \p{Word} and [[:word:]] do not match Unicode Other_Number character (jeremyevans0)
  • Is this a documentation bug or a code bug?
  • If a documentation bug, how specific should the documentation be about what \p{Word} and [[:word:]] match?
• [Bug #19392] Endless method vs and/or (jeremyevans0)
  • Is this a bug or expected behavior?
• [Bug #19416] Inconsistent behaviour for Struct.new without any member_names (jeremyevans0)
  • The fact that Struct.new("A") works seems like a bug and not intentional.
  • Do we want to fix the bug, or keep it to retain backwards compatibility?
  • If we want to fix it, should we deprecate or remove the support in 3.3?

[ko1 (Koichi Sasada)]

• [Feature #19472] Ractor::Selector to wait multiple ractors (ko1)
  • let me take a time to discuss about new Ractor synchronization API

[mame (Yusuke Endoh)]

• [Bug #19230] The openssl backend of securerandom is no longer needed
  • The openssl backend of securerandom has not worked for several years, but we have received no bug reports. I think no one uses it. Let's remove the backend.

[Eregon (Benoit Daloze)]

• [Bug #19473] can't be called from trap context (ThreadError) is too limiting (eregon)
  • This seems a needless limitation on CRuby causing real problems. Let's remove this incorrect exception/limitation?

[ko1 (Koichi Sasada)]

• [Bug #18743] Enumerator#next / peek re-use each others stacktraces (ko1)
  • It should be a bug and there is a proposed patch.

[mame (Yusuke Endoh)]

• Description updated (diff)
• Status changed from Open to Closed