It sounds like the point is to type members before their data in the stream. But that can’t be a huge drain on serializers. JSON isn’t supposed to be incredibly

It sounds like the point is to type members before their data in the stream. But that can’t be a huge drain on serializers. JSON isn’t supposed to be incredibly performant, it’s supposed to be human readable. And with multi core I would expect serializers to read ahead anyway. There was a thing called Reverse Hungarian that put an abbreviation for the type in the variable name. That had some value to work on very small screens without much scrolling.