Since its inception, Let’s Encrypt has been sending expiration notification emails to subscribers that have provided an email address to us via the ACME API. This service ended on June 4, 2025. The decision to end the service is the result of the following…

Perhaps. Learning languages offers other, more concrete benefits

Across Africa, cancer medications have been found to be substandard or counterfeit. That means people are being given medicine that may not work, or that could even cause them harm.

The most famous quote from Knuth’s paper “Structured Programming with go to Statements” is this: There is no doubt that the grail of efficiency leads to abuse. Programmers waste e…

High-Performance Implementation of OpenAI's TikToken. - M4THYOU/TokenDagger

A years-long effort led by Kayvan Memarian and Peter Sewell from Cambridge University, UK, Martin Uecker from Graz University of Technology, Austria, and myself (from ICube/Inria, France) has guide…

Projects, experiments and toys by Rafał Pastuszak

A blog, mostly about programming

Donkey Kong Country 2 has a pretty well-known bug in the old SNES emulator ZSNES where some stages have spinning barrels that don’t work properly. One of the earliest pictured here, in the first stage of Krem Quay (third world):
After you jump into the barrel…

Gnarled JavaScript warlock, musician, cartoonist, dilettante.

LLMs were invented in four major developments... all of which were datasets

Surprising new work bucks 50 years of assumptions about the trade-offs between computation space and time

I write type safe generic data structures in C using a technique that I haven’t seen elsewhere1. It uses unions to associate type information with a generic data structure, but we’ll get to that. My approach works for any type of data structure: maps, arrays…

Context Engineering is the new skill in AI. It is about providing the right information and tools, in the right format, at the right time.

Find more information on using WiFi Motion in the Xfinity app.

Apple's anti-competitive App Store policies are gouging consumers, enabling censorship, and harming privacy-focused developers. We're joining a lawsuit to restore internet freedom.

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Daniel Xu has loved trains since he was a child. In a surprising twist of fate, he now lives above an extensive hobby train network set.

This page provides reference documentation for implementing hooks in Claude Code.