[zzzcpan]

> The purpose of a compression format is not to provide error recovery or integrity verification.

On the contrary. People archive files to save space, exchange files with each other over unreliable networks able to corrupt data, store them in corrupted ram and corrupted disks, even if just temporary. Compression formats are there to help with that, this is their main purpose. This is why fast and proper checksumming is expected, but not cryptographic, like sha256, that adds nothing to this goal but overhead.