Notes by Seokwon Choi, developer. Mostly technical.https://alfex4936.github.io/blog/en-UShttps://alfex4936.github.io/blog/tour/?lang=en/https://alfex4936.github.io/blog/tour/?lang=en/The first post. Everything this blog can put inside a post, one thing at a time: a figure that follows your place, diagrams drawn at build time, math, code, and two languages.Mon, 05 Oct 2026 00:00:00 GMTblogmermaidkatexhttps://alfex4936.github.io/blog/hangul-width/?lang=en/https://alfex4936.github.io/blog/hangul-width/?lang=en/Why one Hangul syllable is as wide as two Latin letters, why arrows and box-drawing characters change width from one setup to the next, and why string length is not a column count.Fri, 02 Oct 2026 00:00:00 GMTunicodetypographyhttps://alfex4936.github.io/blog/redis-hyperloglog/?lang=en/https://alfex4936.github.io/blog/redis-hyperloglog/?lang=en/Counting unique visitors with a SET takes 37 MB for a million; HyperLogLog takes 14 KB. How it counts, and how far off it is, measured.Mon, 21 Sep 2026 00:00:00 GMTredisperformance