[klabb3]

> msgpack doesn't support a binary chunk bigger than 4gb, which is unfortunate.

I don’t care what behemoths people store in the formats they use but at the point you exceed “message size” the universality of any format is given up on. (Unless your format is designed to act as a database, like say a SQLite file.)

> In JSON you could have a 10GB Base64 blob, such as a video, in a string, no problem

Almost every stdlib json parser would choke on that, for good reason. Once you start adding partiality to a format, you get into tradeoffs with no obvious answers. Streaming giant arrays of objects? Scanning for keys in a map? How to validate duplicate keys without reading the whole file? Heck, just validating generally is now a deferred operation. Point is, it opens up a can of worms, where people argue endlessly about which use-cases are important, and meanwhile interop goes down the drain.

By all means, the stateful streaming / scanning space is both interesting and underserved. God knows we need something. Go build one, perhaps json can be used internally even. But cramming it all inside of json (or any message format) and expecting others to play along is a recipe for (another) fragmentation shitshow, imo.