02/15/2026

03:01 PMRubyFeature #19979: Allow methods to declare that they don't accept a block via `&nil`

@kddnewton There is already a PR with both parse.y (from @nobu) and Prism changes: https://github.com/ruby/ruby/pull/11065
I'd be happy to rebase, update that branch and merge any other changes you think are important for Prism.ufuk (Ufuk Kayserilioglu)

01/14/2026

04:42 PMRubyFeature #13683: Add strict Enumerable#single

@Dan0042 If the proposed method isn't going to raise an exception, then how would one disambiguate between a `nil` result because the collection has a single entry which is `nil` and a `nil` result since the collection has (for example) ...ufuk (Ufuk Kayserilioglu)

12/23/2025

12:52 PMRubyBug #21802: segmentation fault when installing gems on CI

Please post the C level backtrace as well. Usually that's very helpful.ufuk (Ufuk Kayserilioglu)

11/18/2025

12:06 PMRubyBug #21696: Performance degradation for long running processes in Ruby 4.0.0-preview2

Did 3.5-preview1 have the same behaviour? If not, could you bisect between the two releases to find the commit that changed the behaviour?ufuk (Ufuk Kayserilioglu)

11/09/2025

12:04 PMRubyBug #21677: Integer("08") raises an ArgumentError

From the docs https://docs.ruby-lang.org/en/3.4/Kernel.html#method-i-Integer:
> With base zero, string object may contain leading characters to specify the actual base (radix indicator):
> ...
So, your strings are interpreted as octa...ufuk (Ufuk Kayserilioglu)

11/05/2025

06:17 PMRubyMisc #21657: Question: Is Ruby 4.0 planned for December 2025 or later?

retro (Josef Šimánek) wrote in #note-17:
> @mame so why to release 4.0 if not causing major breaking changes?
Quoting [my answer to this](https://bugs.ruby-lang.org/issues/21657#note-3) from above:
> ... that is completely a decisio...ufuk (Ufuk Kayserilioglu)

11/02/2025

04:25 PMRubyBug #21659: rstring.h error: missing initializer for field ‘len’ of ‘struct RString’ [-Werror=missing-field-initializers] starting in ruby-3.3.10

Isn't this related to this problem with GCC? https://bugs.ruby-lang.org/issues/21655#change-114967ufuk (Ufuk Kayserilioglu)

10/30/2025

02:52 PMRubyBug #21654: Set#new calls extra methods compared to previous versions

IMO, ranges should behave the same when `end == Float::INFINITY` and when `end == nil`. They are both practically endless ranges, but nothing normalizes them so that they always behave the same. Maybe `(1..1/0.0)` should be internally tr...ufuk (Ufuk Kayserilioglu)

10/29/2025

01:48 PMRubyMisc #21657: Question: Is Ruby 4.0 planned for December 2025 or later?

It seems like the next version of Ruby will be branded as 4.0, but that is completely a decision for @matz to make as he wishes. Ruby version numbers don't follow semantic versioning, so 4.0 doesn't mean that there will be breaking chang...ufuk (Ufuk Kayserilioglu)

08:30 AMRubyMisc #21656: Exclude dependabot PRs from automated gem release notes

There is a configuration file to control which labeled PRs make it into the automated release notes and which ones should be excluded. I can help set that up if it will be helpful.ufuk (Ufuk Kayserilioglu)