I'm not sure I understand this one. But I had the idea you might mean, it doesn't have a human readable prefix identifying what kind of encoding it is. That's

I'm not sure I understand this one. But I had the idea you might mean, it doesn't have a human readable prefix identifying what kind of encoding it is. That's still something I'm considering. I haven't thought that much about it but some ideas that I've glanced at are : data:, urizip:, https://un.co https://un.co as prefixes.