Writing

• Pitfalls I hit on MySQL 5.7 (27 Sep 2026)
  Every four-byte character compares equal, no CTEs, half-dead connections, and a slow public endpoint.
• Why OCR can't fix rare Chinese characters (27 Sep 2026)
  Three root causes, four dead ends, and a single-character classifier trained in 40 minutes.
• How many dpi does book scanning really need? (27 Sep 2026)
  The quotes for 300 and 600 dpi are far apart. I did the math with my own recognition pipeline and existing scans.