Is it dead/abandoned?
There were no activity for a few years and a lot of open issues/pull requests. Does it have any future? It is quite promising so I wonder if the author can add more maintainers to the project who are interested and can improve this lovely serializer.
Please read author's comments on https://github.com/neuecc/MessagePack-CSharp
"Before creating this library, I implemented a fast fast serializer with ZeroFormatter#Performance. And this is a further evolved implementation. MessagePack for C# is always fast, optimized for all types(primitive, small struct, large object, any collections)."
I wish the project status was updated in the readme so that people will be immidiately aware of that