archive source: https://github.com/torvalds/linux/tags
$ file -b linux-6.6.tar.gz gzip compressed data, from Unix, original size modulo 2^32 1419089920 gzip compressed data, unknown method, has CRC, extra field, from FAT filesystem (MS-DOS, OS/2, NT), original size modulo 2^32 1419089920 Hello. The unknown method would be worth revealing by GNU Zip. the addition of a dedicated command option tat reveals the archive properties, among them those relevant ones that are reported by the file-command, would be adequate for this purpose.
