Do you think the library should be accepted as a Boost library? It will be a good addition to Boost if this library gets ACCEPTed What is your evaluation of the design? It works, is straightforward and the interface feels good to use, the only pitfall is getting the right type you want; number_cast took me a second to realize it existed and the custom string class is something the will most likely be converted alot to std::string in an average users' code. What is your evaluation of the implementation? As a casual user I cannot comment on this, but as I used it in stand alone / header only mode without problem I feel that i should be alright under the hood What is your evaluation of the documentation? Could be better, especially in the examples department; it could use how-to basics What is your evaluation of the potential usefulness of the library? Very useful Did you try to use the library? With what compiler? Did you have any problems? I have implemented it in a real project where RapidJSON was used before. No real problems found aside from getting exceptions because .as_double() is not able to get a technically integer from the json (which happens in user configs, example: { "test": 20 }) but that quickly resolved itself with number_cast, Ideally any number should be able to become a double in my opinion. Clang 10.0.1 was used. How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? As stated above implemented in one project which took about an hour. Are you knowledgeable about the problem domain? No, this review is coming from a pure casual user

kindly, Ruthger Dijt