{"ts":"2026-03-17T09:14:32.850Z","level":"info","msg":"valid record before","seq":1}
{"ts":"2026-03-17T09:14:32.970Z","level":"error","msg":"lone high surrogate: \ud800 in the middle","seq":2}
{"ts":"2026-03-17T09:14:33.090Z","level":"error","msg":"unpaired low surrogate: \udfff here","seq":3}
{"ts":"2026-03-17T09:14:33.210Z","level":"info","msg":"valid surrogate pair: \ud83d\ude80","seq":4}
{"ts":"2026-03-17T09:14:33.330Z","level":"info","msg":"valid record after","seq":5}