crc-polynomial-change-breaks-wire-format

Status: IN

Switching from ISO 3309 (`zlib.crc32`) to Castagnoli (CRC-32C) is a backward-incompatible wire format change; existing data files would fail CRC verification without a format version mechanism in the file header.

Source: entries/2026/05/29/topic-crc32-vs-crc32c.md

JSON