One past discussion:

F3: Open-source data file format for the future [pdf] - https://news.ycombinator.com/item?id=45437759 - Oct 2025 (125 comments)

plus this bit:

An Open File Format for storing the information from a forge - https://news.ycombinator.com/item?id=44043253 - May 2025 (1 comment)