Max

"The Shift of Theseus — Toy Bit Provenance Abstract Domain" I just posted this on the PyPy blog pypy.org/posts/2026/1...

My launch day security report about being able to pop a root shell on Muse was just closed with "that's intended behavior"

You know that thing like "would you rather go to the bathroom as usual or only for 24h straight one day a year" I do that except for my meetings, which are all on Mondays. I'm actually pretty happy with it, except for Mondays

I also wrote a post for work with an intentionally rage bait title. Hello compiler friends I'm sorry in advance railsatscale.com/2026-10-21-r...

Ruffles have ridges. Objects have shapes bernsteinbear.com/blog/object-...

Just set up Home Assistant. I am about to become insufferable.

Still 100% undefeated at washing and drying a dress shirt immediately before an Event. Nobody else enjoys when I do this

I love a good register allocator writeup: hexrat.cc/pages/blog/2...

ZJIT is now as fast as YJIT: railsatscale.com/2026-10-09-z...

They're playing a Eurythmics+Sean Paul remix at this wedding and I'm into it?

See you in one hour 👀

Ooh, hydrangea Oh also yes compiler compiler compiler

only reason I'm putting my pencil down is to read this fuckin cool paper https://bernsteinbear.com/blog/support-local-variables/

hi friends I'm very excited to announce Halfspace, my experimental cross-platform IDE for solid modeling with distance fields! This has been in progress since midway through last year, and it's finally "done enough" to make it more public.

my kingdom (small rented apartment) for a no-fuss dishwashable milk frother without any nonstick or plastic crap in it

you know, i thought the reputation of cousot papers was at least a little exaggerated but no, they actually look like that lol (this is page 3)

Do you enjoy your beans al dente? Please explain.

My RubyKaigi 2026 talk about ZJIT is up! Unfortunately, they censored my memes :( youtube.com/watch?v=ypRK...

You should be making more friends on the Internet www.nytimes.com/2026/09/06/s...

Ruby's GC and ZJIT got a new collab! We recently introduced inlining of the garbage collector's fastpath into ZJIT. Read more about it here: railsatscale.com/2026-09-01-z...

New paper with the ZJIT team! Local variables in Ruby are ... complicated. bernsteinbear.com/assets/img/s...

We'll present a paper about ZJIT at VMIL'26! conf.researchr.org/details/spla...

VMIL'26 has a program! Looks very interesting. Static Analysis, optimizing Android's GC, understanding R's benchmarks, optimizing Ruby, and lots more! The SPLASH early registration deadline is September 3rd! Program: conf.researchr.org/home/splash-...

Do it! It's so great

More SSA fun! bernsteinbear.com/blog/more-pa...

New blog post: Computing graph dominators Diving into an algorithm. neugierig.org/software/blo...

More SSA fun! bernsteinbear.com/blog/more-pa...

Working in Lua VM. Smells like upvalue in here

Chris and I wrote a thing about zero knowledge proofs bernsteinbear.com/blog/zkp/

Need a new Cousot-branded spirit called "absint"

A history of Ruby's Hash tables, and how we can make them use less memory: byroot.github.io/ruby/perform...

Quite enjoyed The Devil Wears Prada 1

Someone's gotta investigate why Mexican music and German music sound so similar. Do they both love polka

Have you all ever had a Google workspace Group ever silently drop emails to its members? I just discovered that we're missing emails left and right. They appear in the log on the admin console but not in our inboxes or spam.

All that effort to implement sparse conditional constant propagation only to find out that fixpoint looping over RPO is faster

I love getting push notifications that Sofi Tukker dropped a new song. Probably the only kind of unsolicited notification I appreciate

So the cool thing about hotel room locks being battery powered is that the batteries die and you can't get into your room. Isn't that fun?

compiler

Heading home from PLDI26. Met great people, learned tons of stuff, and I feel very inspired! Wish I had attended PLDI conference sooner

Is a module system "export control"?

PLDI people tell me that Neil Jones never actually landed on the moon. It was staged