A debugging story tracing why a PostgreSQL query with `ORDER BY random() LIMIT 10` hung while `LIMIT 9` worked fine. The root cause was a bug in undici's WebSocket implementation: when encoding a 16-bit extended payload length (triggered at exactly 126 bytes), it created a DataView over a Buffer's backing ArrayBuffer without accounting for byteOffset. Because Node's Buffer.allocUnsafe() may allocate small buffers as sub-arrays of a global pool with a non-zero byteOffset, the payload length was written to the wrong memory location — corrupting data and causing the connection to hang. The fix was to pass the correct byteOffset and byteLength to the DataView constructor, and was released in undici 5.22.1.
