Well, you invented one of the best things since sliced bread! I love NDjson, being able to parse a sequence of {} objects as an array is just frankly more natural. A coworker got some absurd speedup going from some massive json array to ndjson.

Honestly if json had as part of its spec line-delimited arrays, and accepting NaN, it'd be close to perfect. Oh and native ints, but that is JS's problem.

Well, and a single, canonical spec. And a hard limit (however high) on nesting depth. And some other things. Ok, maybe it's far from perfect.