This was specifically about having a fileformat encoding binary data, and in that vein there is a place for PPM, it's probably better for many small bitmaps tha

This was specifically about having a fileformat encoding binary data, and in that vein there is a place for PPM, it's probably better for many small bitmaps than PNG. My old PPMs from my email archive look horrible as jpegs https://xkcd.com/1683/ https://xkcd.com/1683/ . JSON vs. Bencode, JSON can get you the data good enough a lot faster, while a bencode parser is easier to write. My feeling is that most formats with schemas usually fail somewhere in the details anyways. Honestly I think I want too much from them; e.g. the YANG Data model language is a kitchen sink but lacks a lot.