Yes, all these posts don't say that
They insist on 'reader macros' being essential to modifying the JSON parser and parsing(reading-macro) JSON files.
As if you need 'reader macros', them being an essential component
of JSON parsing.
Reality: modifying the JSON parser directly is much simpler than inventing a new sub-language just for specific JSON sub-format(running regex-replace on that specific sub-format is even simpler).