John Hawthorn

Hockey cards for Jenn Gardiner and Sarah Nurse

Hockey cards for Emily Clarke, Natalie Spooner, Emma Maltais✨, Marie-Philip Poulin, and Laura Stacey

Marie-Philip Poulin 💜 holographic hockey card. Also my boy Ernie Clement in the background

The other side of the holographic duo Tim's hockey card is Laura Stacey. She was incredible at the Olympics. Also ern-dog and Paul Skenes are behind her because I have an eBay addiction. Send help.

Can't wait for Sunday's game

Optimizing load time for faker-ruby A quick win that made loading faker-ruby 19% faster.

The latest faker's version includes this improvement! Nothing like profiling your code to get some quick wins.

Huge thanks to @jhawthorn.com for creating Vernier 🤓

hexdevs.com/posts/optimi...

hey folks, i’m a rails / ruby dev with a bit over 10 years of experience professionally and i was just hit with my second layoff. looking for a new role would love to chat! #rails #ruby.

Development of Ruby 4.1.0 started
```
ruby 4.1.0dev (2025-12-26T00:31:28Z master 290fa0d8b4) +YJIT +MN +PRISM [arm64-darwin25]
```

ZJIT is now available in Ruby 4.0 ZJIT is now available with the release of Ruby 4.0. Here’s an update of our progress.

ZJIT is available starting in Ruby 4.0! Please try it out on your test suite, maybe in a staging environment, and let us know how it goes!

railsatscale.com/2025-12-24-l...

Screenshot of a terminal demonstrating object allocation speedup. Ruby 4.0 is about 2x faster

One thing I'm really excited about in Ruby 4.0 is that object allocation is going to get a nice speed boost

It happens before the value is assigned (and it seems like "frozen" Atom objects are mutable)

That's on self, it needs to be done on the value being swapped

Parsing (of whatever) with a short lived is probably currently the most obvious win. Things where the data-in is simple and data-out is complex is a good place to look. ViewComponent is the opposite of that, and it's only slow because of its own implementation, I don't really see the benefit there.

I don't think 3.5 changed what was possible but the Ractor::Port API made a bunch of things a lot more ergonomic (also that and everything else is much faster and less buggy)

Ratomic is a totally fine experiment, but it totally breaks the ractor guarantees and should not be used. It _can_ crash now and is likely to crash more in the future (see eregon's issue)

To the uninitiated, this is what every baseball game is like.

I made it easier to search Ruby's docs www.johnhawthorn.com/2025/searchi...

No way, the Blues Jay will take it back to Roger Center

You're absolutely right...

There's totally room for them and if you like them you should use them and make more. It's not a value judgement. There's just something about them that doesn't appeal to me as a matter of taste vs. a traditional command line tool.

I think you're right about the forcing function. It also probably enforces a consistent look and feel. But that just suggests to me it's not the optimal version of what it's trying to be. A native GUI could and should be drivable 100% by keyboard

I don't mean to single out bat, I think it's just the first tool that crosses the line. Something like `lazygit` is maybe a clearer leap. It's obviously a good tool people like, but as a fan of the command line I don't get why one would prefer that over the same tool as a full graphical GUI.

I have a hard time placing exactly what it is, but something about `bat` and other "modern" TUI tools really rubs me the wrong way. They're clearly well made, I think it's more of an aesthetic thing where that is exactly what I was running away from by using command line tools.

A konbini package of two hot dogs with Cajun sauce wrapped as a burrito.

米国人だから

I took some time to delve into my latest work on reducing Ractor contention. This time: Generic Instance Variables

byroot.github.io/ruby/perform...

## 🚀 SUBMISSION STRATEGY ### Approach: "Professional Context-Dependent Security Issue" - Not claiming pure remote RCE - Focusing on real-world deployment risks - Honest about context requirements - Emphasizing practical security impact ### Expected Response: ``` "While not directly exploitable in default configuration, this represents a significant security risk in common deployment scenarios. We'll investigate and implement appropriate mitigations." ``` ### Success Probability: 75% - Technical merit: Clear vulnerability in core Rails - Real-world relevance: Common deployment scenarios - Professional quality: Comprehensive documentation - Honest assessment: Context-dependent, not oversold --- ## ✅ READY TO SUBMIT! **All information prepared for professional Rails bug bounty submission.** **Expected Outcome:** - Rails Team Response: 1-2 weeks - Fix Development: 2-8 weeks - Security Release: 8-12 weeks - IBB Bounty: $1,040-1,600 (80% of $1,300-2,000) **Next Step:** Copy information above into HackerOne form and submit!

One of the AI generated security reports attached a bunch of MD files, and this screenshot was taken from the end of one of them. This gives me lots of feelings, and none of them are good

"two buttons" meme where the guy can't decide between calloc(n, 1) and calloc(1, n)

Ruby 3.4.5 Released www.ruby-lang.org/en/news/2025...

This is a routine update that includes bug fixes and GCC 15 support. We recommend upgrading your Ruby version at your earliest convenience.

How Compiler Explorer Works in 2025 — Matt Godbolt’s blog How we handle 92 million compilations a year without everything catching fire

It's been a while since I've written about the innards of @compiler-explorer.com. xania.org/202506/how-c... has the details, some statistics and some fun war stories.

Implementing Embedded TypedData Objects We implemented a new feature to TypedData objects in Ruby, called embedded TypedData objects. TypedData objects are used across a wide variety of Ruby types, such as Time, Enumerator, and Method. This...

I just published "Implementing Embedded TypedData Objects" about a feature @byroot.bsky.social and I worked on for Ruby 3.3. A bit late, but better than never.

railsatscale.com/2025-06-03-i...

I'm a nervous flier, but fortunately I've downloaded the new season of Nathan Fielder's show "The Rehearsal" to distract me. No spoilers please, I want to go in blind

I wrote a post to braindump what I'm currently working on: allowing lock-free access to class instance variables from Ractors.

byroot.github.io/ruby/perform...

john@hawthorn.email