Another name for this is JWCC. IMO very good argument for this feature set here:
https://nigeltao.github.io/blog/2021/json-with-commas-commen...
https://nigeltao.github.io/blog/2021/json-with-commas-commen...
The "Why not JSON5, JSONC #1, HJSON or HOCON instead?" answer says it's because of "unquoted strings", then links to a section that only talks about unquoted values. JSON5 doesn't have unquoted values.