{"ts":"2026-03-17T09:14:32.850Z","level":"info","msg":"first value","msg":"second value","seq":1}
{"ts":"2026-03-17T09:14:33.100Z","level":"debug","level":"error","msg":"level declared twice","seq":2}
{"ts":"2026-03-17T09:14:33.350Z","user":{"id":"a","id":"b"},"msg":"duplicate key nested","seq":3}
{"ts":"2026-03-17T09:14:33.600Z","level":"info","msg":"no duplicates here","seq":4}