Because the previous changes to the file format were done by changing the last two initials of the magic. Someone commented on the pull request suggesting using

Because the previous changes to the file format were done by changing the last two initials of the magic. Someone commented on the pull request suggesting using a version field instead, which hadn't been documented, but Gerganov was so happy with the mmap() contribution that he asked me to keep the initials. So you should ask him why he wanted my initials to be there. I didn't see anyone else raise concerns until later on when the 4chan raid happened. I guess I failed to consider that folks who hate trans women would feel uncomfortable needing to mark their files with the initials of one. Here's the pull request: https://github.com/ggerganov/llama.cpp/pull/613 https://github.com/ggerganov/llama.cpp/pull/613