Big thanks to Amirouche for taking up this important job!

You mentioned JSON Lines (<http://jsonlines.org>). This is a great file
format for structured logging (where each log entry is written as an
easy-to-parse record instead of a free-form line of text).

I'd love having a procedure in the SRFI to explicitly write a JSON Line
(i.e. one JSON value containing no literal newlines) to a port.
Something like:

(json-write-line obj [port])

Or if a procedure is added that takes custom rules for the output (e.g.
how many spaces to indent), JSON Lines be a preset for those rules.