Research notes, data wrangling, and a few small tools.https://erictseng.icu/en/enhttps://erictseng.icu/en/blog/mysql57-pitfalls/https://erictseng.icu/en/blog/mysql57-pitfalls/Every four-byte character compares equal, no CTEs, half-dead connections, and a slow public endpoint.Sun, 27 Sep 2026 00:00:00 GMThttps://erictseng.icu/en/blog/ocr-rare-characters/https://erictseng.icu/en/blog/ocr-rare-characters/Three root causes, four dead ends, and a single-character classifier trained in 40 minutes.Sun, 27 Sep 2026 00:00:00 GMThttps://erictseng.icu/en/blog/scan-dpi/https://erictseng.icu/en/blog/scan-dpi/The quotes for 300 and 600 dpi are far apart. I did the math with my own recognition pipeline and existing scans.Sun, 27 Sep 2026 00:00:00 GMT