rosa.codes

Mon, 01 Jan 0001 00:00:00 +0000

Some supporting links for the “From SMTP to the Imbox*” talk I gave at the BilboStack conference in January 2023.

Mon, 01 Jan 0001 00:00:00 +0000

Some supporting links for the “50 languages in 50 days*” talk I gave at the South West Ruby meetup in December 2022.

“Invalid byte sequence in UTF-8” 😭

Mon, 01 Jan 0001 00:00:00 +0000

Resources to learn more about strings, encoding, Unicode…

Mastering Ruby - Strings and Encodings - Book by Aaron Lasseigne
Guide to string encoding in Ruby - Article by Aaron Patterson
Pragmatic Unicode, or How do I stop the pain - Talk by Ned Batchelder at PyCon 2012 (from 2010, still great!)
The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!) - Article by Joel Spolsky (from 2003, still great!)
The Absolute Minimum Every Software Developer Must Know About Unicode in 2023 (Still No Excuses!) - Article by Nikita Prokopov

about

Mon, 01 Jan 0001 00:00:00 +0000

👩🏻‍💻🐰🕳️ I’m a software engineer who loves writing code, investigating tricky bugs down rabbit holes and helping others above all things. I value curiosity, generosity and humility very highly. I think the three are very closely related.

📚🧮 I have a background in theoretical computer science and I wanted to study pure mathematics. I’ll do it one day.

💬🗺️ I’m a polyglot at heart, trying to be a polyglot on the outside. I love learning programming languages, even in absurd ways, and human languages as well.

Bringing Offline Mode to Hotwire with Service Workers ⚡

Mon, 01 Jan 0001 00:00:00 +0000

Some resources to accompany the Rails World 2025 talk of the same name, and learn more:

Service worker mindset - web.dev, by Dave Geddes
The service worker lifecycle - web.dev, by Jake Archibald
Workbox
The Future of: PWAs on Rails - Talk by Edy Silva at RailsConf 2025
Master Hotwire - book by Radan Skorić
Chromium bug - Unable to set User-Agent header - it hasn’t been fixed as of 2025-08-25, but it’s being worked on as I write this (last update on 2025-08-20)

Machines that talk about themselves

Mon, 01 Jan 0001 00:00:00 +0000

Sentences and expressions

An expression is any combination of the symbols P, N, A, -. For example, NPA—P-A.
A sentence is an expression with an assigned meaning.

The printing machine 🖨️

We’re giving a printing machine, and we call an expression printable if the machine can print it.

P-X means “X is printable”
NP-X means “X is not printable”

The associate of an expression X is X-X.

PA-X means “the associate of X, X-X, is printable”
NPA-X means “the associate of X, X-X, is not printable”

A sentence is an expression of the following 4 forms:

scpna2022

Mon, 01 Jan 0001 00:00:00 +0000

Some supporting links for the “50 languages in 50 days*” talk I gave at the Pamplona Software Crafters conference in 2022.

The curious incident of the incomplete executor 🕵🏻‍♀️

Mon, 01 Jan 0001 00:00:00 +0000

You can find slides for the talk given at Tropical on Rails 2025.

Some resources to accompany the talk and learn more:

Rack @ The weekly iteration – Upcase by thoughtbot
Rails executor – Rails Guides
Rails Executor: the border between application and framework code - Talk by Andrey Novikov from Evil Martians at Kaigi on Rails 2023 (Japanese 🇯🇵)
Dissecting Puma: Anatomy of a Ruby Web Server – Amazing deep dive on Puma internals by Dan Svetlov
Change that moved body.close in Puma
Authentication with cookies unreliable on 5.6.0 #2808
[CVE-2022-23633] Possible exposure of information vulnerability in Action Pack – CVE in Rails forums
Information Exposure with Puma and Rails – Security advisory in Puma
ActionDispatch::Executor don’t fully trust body#close – Fix in Rails executor to make it more resilient