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For needs in https://github.com/lighttransport/gltf-insight, I'm writing an obj serializer. I figure it may be valuable to use tinyobj's data structure as an intermediate, since you have everything here to represent a obj file in memory.
Doing so, it make sense to write the code that write the files inside the library itself.
This is a draft, it's not ready to be merged yet, but this will permit you to easily follow the progress of my fork, in case you are interested into it.