Me too, and was initially disappointed. Now I think about it, it's super cool that GitHub are putting so much effort into being a useful platform for file form

Me too, and was initially disappointed. Now I think about it, it's super cool that GitHub are putting so much effort into being a useful platform for file formats traditionally not associated (much) with software development. There is so much cool stuff you could investigate over and above text files: understanding photoshop files and describing layer changes; diffing audio and identifying mixes and how they were mixed.