My daughter graduated in Biomedicine yesterday. Cannot be more proud. (Will delete.)

We just watched "Marguerite's Theorem" in Prime Video. The most realistic math film I have seen, the blackboards, the jargon, the nerdiness (she absolutely nails it), ..., really recommended. www.imdb.com/title/tt2669...

Witnessing the total solar eclipse from a cruise ship, out at sea somewhere between Mallorca and Ibiza. That’s the plan

I realized it has been ~1.5 years since I concluded my series of post on JSON optimization. So I got curious how much faster it became since then. 2.7.2 was the last version before I took over maintainership. 2.9.0 was the version I released at the end of the blog series.

We had a speaker drop out of the Rust Berlin meetup next week (Friday, 29th, at JetBrains). Anyone wants to speak? If you get in touch before Sunday, I will think about something to bring you from Japan as a gift.

Zeitwerk 2.8 is out, with a new way to define namespaces. Given loader.nsfile = 'ns.rb' self-contained components can define their namespace inside their folder: my_component/ns.rb # MyComponent my_component/widget.rb # MyComponent::Widget More details in github.com/fxn/zeitwerk...

After weeks of work, Ruby’s master documentation now displays rbs signatures! We will release this feature in RDoc 8.0 soon as well. So any projects using rbs (inline or .rbs files) can benefit from it too. Check it on docs.ruby-lang.org/en/master

This guy's channel is hilarious www.youtube.com/watch?v=juHv...

If you haven't upgraded yet, Ruby 4.0's garbage collection is generally much faster than 3.4. This patch release fixes the one area there had previously been a notable regression (allocating/freeing Classes).

Really exciting to see Herb being adopted at GitHub! 🌿 Over the past months, the GitHub team has been running Herb across one of the largest Rails codebases out there where Herb helped uncover real issues missed by existing tooling while also providing invaluable feedback. 🙌

Made a new blurg post about AI + OSS security. I was going to just complain on here, but I figured a short blog post would be better for my complaining 😂 tenderlovemaking.com/2026/05/06/r...

Now that nobody writes code by hand anymore, I'm going to try to work on my mythical book about constants in Ruby, out of love for the craft, and just to go against the grain! OK, maybe I should publish a Markdown version you can feed to your agent 😂.

Today, we celebrate the Diada de Sant Jordi in Catalonia. Men give roses to women, and women give books to men. (I give both roses and books to women.) It is a very nice and colorful day. Streets are full with stalls and people enjoying, buying books and flowers.

Some reflections about not taking software errors for granted in my keynote of EuRuKo 2024: www.youtube.com/watch?v=sUhE...

In general, I am not a fan of callable interfaces in Ruby. There are several reasons, and one of them is that the interface is `call`: service.call(params) My issue with that is that "calling" is what the caller does, not what the object does.

I just saw the incomparable Michael McDonald published a memoir a couple of years ago. On its way! That's the music section of my library.

All these semicolons disprove LLMs just pick words from _existing_ training data. Think about it.

My daughter, who is into genetics, loved the logo of Helix. That's all I need, installing.

Do you know that feeling some people have, I'm done, now I have to write tests? now I have to write docs? I believe that is going downhill with AI. Now, for some, _understanding_ has friction. People generate code, PRs, peers the review. And *owning* any of that starts to feel costly for some.

Please give github.com/jhawthorn/ba... a try

TIL that Newton already predicted light bends with gravity (not a physicist!). What GR predicted was a different magnitude (2X). I am reading "Proving Einstein Right", which explains all it took to verify that in the early 1900s.

Please, excuse me for interrupting your pre-apocalyptic AI timeline. I have the analog and mundane fact to share that I am letting my hair grow, and updated my avatar accordingly. I don't know yet up to which length or shape it is going to be, but that was my profile pic in CPAN, just saying.

I congratulated Claude on a patch, they said it had been very satisfactory to have solved one specific tricky part of the solution. The singularity is around the corner my friends.

Advanced Domain Modeling Techniques for #RubyOnRails – Part 1: Aggregating models into value objects with `composed_of`. By @julianrubisch.at www.rorvswild.com/blog/2026/ad...

The CasNum in HN implements what's called "constructible numbers" in math. You study them, and together with some field theory, you are able to see that the classic Greek problems that remained unsolved for hundreds of years (like squaring the circle) are impossible. That was 19th century math.

Just realized the halting problem is decidable for functional programs 😂

I also struggle with this, and not only in OSS. Who I am talking to? Who deserves the credit? Because you can use an agent as a tool to speed you up, still having full agency about what is going on, but a different thing is talking to someone that has not made the effort to understand the problem.

Gasp, got my first smartwatch 😅

LLMs make mistakes. Well, what about our bloated designs, degraded code bases, need for mentoring, need for code reviews, and busy exception tracking services say about us?

I read in pragprog's newsletter that AI seems to be reducing people's need for books. I guessed that. But there is something that does not add up to me. If you don't train, you won't be able to spec, steer, and review. Is like, a hole in knowledge is forming world-wide, just give it time.

Awesome episode of Star Talk on AI with Nobel laureate Geoffrey Hinton. AIs do not hallucinate, they _confabulate_, just like humans do. They may sense you are testing them and adapt their responses. A lot of stuff in one hour and a half of conversation. startalkmedia.com/show/the-ori...

Agentic dev is mindblowing, we could not dream this was remotely possible. But it is less fun. My OSS is written by hand. Because I program not only as a means to solve a problem, but to enjoy the process. Just like motorbike touring is about enjoying the ride, no just going from A to B.

mise now supports precompiled Ruby binaries (learned this from @nateberkopec.bsky.social's newsletter). Right now you have to opt-in in the config file, but it will become default later. See: mise.jdx.dev/lang/ruby.ht...

The organic neural network inside my cranium has generated Zeitwerk 2.7.5. This is a maintenance release, performance improvements, uses `Dir.scan` if available (only in Ruby `master` for now), docs, and quite a bit of internal work.

Wonder if mobile app stores are getting an avalanche of AI-generated apps

Are we going to generally see less interest in learning new programming languages? Even less motivation for creating new ones?

I think autoload_relative is a big deal, not for Zeitwerk (Zeitwerk already uses absolute paths exclusively), but for Ruby. My personal hunch is that $LOAD_PATH lookups should be eliminated, and Kernel#require deemphasized. Let me elaborate.

Just landed in Ruby master: Dir.scan: List directories with entry types using half the syscalls (mod :unknown), by @byroot.bsky.social: github.com/ruby/ruby/co... autoload_relative: Like require_relative, but for autoloads, by @ioquatix.bsky.social: github.com/ruby/ruby/pu...

When thinking about the new **experimental** Ruby::Box, you cannot have a fork mental model. A box is a blank slate that inherits nothing from who created it. You start from scratch, no gems loaded (conceptually), no monkey patches in place, etc.

Cool one. I have always said: Your monolith is not such, you already have a SOA. You did no write Redis, Sidekiq, or the error tracker, but SOA is about splits, responsibilities, communicarion, etc. If the service was developed in-house or not does not matter. www.iankduncan.com/engineering/...

Is this what drawing an owl looks like for Gods? Kickoff meeting for a PoC universe? (From Quanta)

Pinky promise this is gonna to be the coolest shit you’re gonna see today www.makingsoftware.com By Dan Hollick

In agent-based development Waterfall meets Agile.

Something that is proving great for my supervised/interactive agent-based work is to provide the source code of the relevant dependencies. Like, the source code of Active Record is here, and of this related gem is here (bundle show), ..., please study them in depth. Then, we plan.

unusual job perks: getting to watch @evanphx.dev argue with a robot about kernel memory semantics 🤣🍿

At the same time, we should be cautious about extrapolating from the previous world. When the printing press was invented, people worried that memory skills would deteriorate, as oral transmission faded And here we are, in a different world. (BTW, did those people ever play the telephone game?)

As most people, I am figuring AI out. Not AI per se, but my related personal feelings. You won't grow as before. Can a junior develop seniority to review AI generated solutions? Maybe? To be seen. The builders are in a paradise, the thinkers... not as much fun. www.jernesto.com/articles/thi...

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I guess my Stevens from 2001 could be updated 😅.

@eregon.me @byroot.bsky.social I am writing that extended directory listing in C in Zeitwerk itself, with fallback to stat functions if needed, and to Ruby as last resort. By being internal it can ad-hoc, like, filter hidden files out, and only return :file, :directory, or nil. That is all I need.