> I think largely to do things with messages you don't know about is probably a bad idea in general Versioning, at the least, is extremely difficult without th

> I think largely to do things with messages you don't know about is probably a bad idea in general Versioning, at the least, is extremely difficult without this. Look at the Vulkan API for an example of what they have to do in C to manage this. They have both an sType tag and a pNext extension pointer in order for past APIs to be able to consume future versions.