.NET 9 will be putting BinaryFormatter out to pasture

Thank you. This is a really good explainer for what is happening.

I've used MessagePack[1] and MemoryPack[2] for some internal binary serialization. It'd be nice to have a (safe) BCL option.

[1] https://github.com/MessagePack-CSharp/MessagePack-CSharp [2] https://github.com/Cysharp/MemoryPack