Created by: askreet
When attempting to build on the native platformIO framework, it attempts to compile a linkable .a despite this library being header-only. In https://github.com/bblanchon/ArduinoJson/issues/731 it was suggested to use libArchive (which did not seem to work) but the submitter eventually used lib_archive at the project level.
This is, I assume, a better fix as the project-level setting will apply to all dependencies. I was able to build with this setting, at least.