Maciej Mensfeld

mensfeld.pl

Blog about coding in various languages, security, and my other IT adventures.

Popular posts: 2
Total points: 279
HN comments: 190
Rank: #9,543 personal

Visit mensfeld.pl → RSS feedOn Hacker News Nov 2022 – Nov 2025

Software Engineering 2 Programming Languages 1 Career & Management 1

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Ruby concurrency is hard: how I became a Ruby on Rails contributor

2022142 points128 comments Software Engineering details

For the past several weeks, I've been trying to fix a cranky spec in Karafka integrations suite, which in the end, lead me to become a Ruby on Rails micro-contributor and submitting similar fix to several other high-popularity projects from the Ruby ecosystem. Here's my story of trying to make sense of my specs and […]

When your hash becomes a string: Hunting Ruby's million-to-one memory bug

2025137 points62 comments Software Engineering details

An "impossible" Ruby bug: Hashes becoming Strings at runtime. 2,700 identical crashes. No corruption. Just objects changing what they are. Deep dive.