Everlasting student · Rails Core · Zeitwerk · Freelance · Life loverhttps://bsky.app/profile/fxn.bsky.socialhttps://bsky.app/profile/fxn.bsky.social/post/3mjlu5vfnec2ySome reflections about not taking software errors for granted in my keynote of EuRuKo 2024: https://www.youtube.com/watch?v=sUhElM03QB4&t=2200s16 Apr 2026 07:10 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mjlu5vfnec2yhttps://bsky.app/profile/fxn.bsky.social/post/3mjgpnaxqm22iIn 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.14 Apr 2026 06:06 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mjgpnaxqm22ihttps://bsky.app/profile/fxn.bsky.social/post/3mjc4ar3r2c2oI 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.12 Apr 2026 10:08 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mjc4ar3r2c2ohttps://bsky.app/profile/fxn.bsky.social/post/3mj3273pp2s2sAll these semicolons disprove LLMs just pick words from _existing_ training data. Think about it.09 Apr 2026 14:43 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mj3273pp2s2shttps://bsky.app/profile/fxn.bsky.social/post/3miopy7zxkk2eMy daughter, who is into genetics, loved the logo of Helix. That's all I need, installing.04 Apr 2026 17:08 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3miopy7zxkk2ehttps://bsky.app/profile/fxn.bsky.social/post/3mij2p3aocs24Do 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.02 Apr 2026 11:04 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mij2p3aocs24https://bsky.app/profile/fxn.bsky.social/post/3mhiev2eibk2tTIL 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.20 Mar 2026 11:08 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mhiev2eibk2thttps://bsky.app/profile/fxn.bsky.social/post/3mhd6vsdc5k2pPlease, 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.18 Mar 2026 09:38 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mhd6vsdc5k2phttps://bsky.app/profile/fxn.bsky.social/post/3mgxqk5og2226I 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.13 Mar 2026 20:22 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mgxqk5og2226https://bsky.app/profile/fxn.bsky.social/post/3mgiq4mkotc2aThe 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.07 Mar 2026 21:04 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mgiq4mkotc2ahttps://bsky.app/profile/fxn.bsky.social/post/3mgd4sab2x22vJust realized the halting problem is decidable for functional programs 😂05 Mar 2026 15:35 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mgd4sab2x22vhttps://bsky.app/profile/fxn.bsky.social/post/3mgcm4yg3x22gI 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. [contains quote post or other embedded content]05 Mar 2026 10:37 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mgcm4yg3x22ghttps://bsky.app/profile/fxn.bsky.social/post/3mg6eby6aus2uGasp, got my first smartwatch 😅03 Mar 2026 18:06 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mg6eby6aus2uhttps://bsky.app/profile/fxn.bsky.social/post/3mftijbf36k2tLLMs 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?27 Feb 2026 10:22 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mftijbf36k2thttps://bsky.app/profile/fxn.bsky.social/post/3mfpo6fabtk2cI 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.25 Feb 2026 21:53 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mfpo6fabtk2chttps://bsky.app/profile/fxn.bsky.social/post/3mfltksflh22pAwesome 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. https://startalkmedia.com/show/the-origins-of-artificial-intelligence-with-geoffrey-hinton/24 Feb 2026 09:19 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mfltksflh22phttps://bsky.app/profile/fxn.bsky.social/post/3mfj5inbzrs2iAgentic 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.23 Feb 2026 07:38 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mfj5inbzrs2ihttps://bsky.app/profile/fxn.bsky.social/post/3mfeaxykewc2gmise 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: https://mise.jdx.dev/lang/ruby.html#precompiled-binaries21 Feb 2026 08:57 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mfeaxykewc2ghttps://bsky.app/profile/fxn.bsky.social/post/3mf74yjktvs2oThe 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.19 Feb 2026 08:03 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mf74yjktvs2ohttps://bsky.app/profile/fxn.bsky.social/post/3mf3fpcyq7s2vWonder if mobile app stores are getting an avalanche of AI-generated apps17 Feb 2026 20:28 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mf3fpcyq7s2vhttps://bsky.app/profile/fxn.bsky.social/post/3merfruxask2kAre we going to generally see less interest in learning new programming languages? Even less motivation for creating new ones?13 Feb 2026 21:03 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3merfruxask2khttps://bsky.app/profile/fxn.bsky.social/post/3meqdap5zgc2dI 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.13 Feb 2026 10:45 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3meqdap5zgc2dhttps://bsky.app/profile/fxn.bsky.social/post/3mepxj6f4r225Just landed in Ruby master: Dir.scan: List directories with entry types using half the syscalls (mod :unknown), by @byroot.bsky.social: https://github.com/ruby/ruby/commit/3b5ee7488c8064cd3b1afc41bc43afdb907fdf16 autoload_relative: Like require_relative, but for autoloads, by @ioquatix.bsky.social: https://github.com/ruby/ruby/pull/1614813 Feb 2026 07:15 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mepxj6f4r225https://bsky.app/profile/fxn.bsky.social/post/3mel4jloskk2uWhen 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.11 Feb 2026 09:01 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mel4jloskk2uhttps://bsky.app/profile/fxn.bsky.social/post/3mejqf2zea224Cool 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. https://www.iankduncan.com/engineering/2026-02-09-what-functional-programmers-get-wrong-about-systems/10 Feb 2026 19:51 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3mejqf2zea224https://bsky.app/profile/fxn.bsky.social/post/3meihaf5q2k2pIs this what drawing an owl looks like for Gods? Kickoff meeting for a PoC universe? (From Quanta)10 Feb 2026 07:35 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3meihaf5q2k2phttps://bsky.app/profile/fxn.bsky.social/post/3me6rzbujik2dIn agent-based development Waterfall meets Agile.06 Feb 2026 11:21 +0000at://did:plc:dbfb7k4eiwvy6pomjvexsief/app.bsky.feed.post/3me6rzbujik2d