looks like this is a kind of intrusive serializer. I usually avoid using intrusive serializer and prefer non-intrusive one. But I believe your library can be modified to support non-intrusive mode too, because you already using macros, and Nim macros can easily handle non-intrusive serializer.
why I prefer non-intrusive serializer? Imagine I already using a huge library with tons of objects. Then one day I decide that I need to serialize those objects, it would be painful if the serializer only in intrusive mode because I have to annotate each of the objects. But if the serializer also support non-intrusive mode, I don't need to modify my huge library. I just need to serialize it and done. anyway, what you have done is awesome.
