Dmitry's Q4 2023 Update

https://cppalliance.org/dmitry/2024/01/12/dmitrys-q4-update.html

In Q4 2023 the JSON library’s direct parsing was completed and released in Boost 1.84.0, after which work shifted to implementing direct serialization using the standard serializer, with performance optimizations, CIdriven benchmarking, and coverage analysis guiding refactoring; completion is targeted for the next Boost release.