The 30-year-old keyboard bug: How a Polish letter Ś disappeared from Medium's editor
By
Marcin Wichary
Summary
A deep-dive investigation into a mysterious bug on Medium's text editor where Polish users couldn't type the letter 'Ś' (S with an acute accent). The author traces the root cause through a fascinating chain of dependencies: a JavaScript keypress handler, a legacy ASCII-based keyboard mapping system from the 1980s, and ultimately a 30-year-old bug in a Polish terminal program called 'implant' that incorrectly mapped the Ś key. The article explores how old technical decisions, encoding limitations, and historical quirks of computing can silently persist and cause unexpected problems decades later.
Source
Hacker NewsThe 30-year-old keyboard bug: How a Polish letter Ś disappeared from Medium's editoraresluna.orgKey quotes
· 5 pulled"I just started an article in Polish. I can type in every letter, except Ś. When I press the key for Ś, the letter just doesn't appear. It only happens on Medium."
"This was odd. We don't really special-case any language in any way, and even if we did… out of 32 Polish characters, why would this random one be the only one causing problems?"
"The bug was three decades in the making. It started with a Polish terminal program called 'implant' from the 1980s, which had a bug in its keyboard mapping for the Ś key."
"What seemed like a simple, isolated bug turned out to be a fascinating journey through the history of computing, encoding standards, and the long tail of technical debt."
"The Ś key on a Polish keyboard doesn't just produce 'S' — it produces a character that has been fighting against encoding limitations and legacy systems for decades."
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