If this is intended for reading and writing by humans, then JSON doesn't cut it since you don't get comments (and perhaps also because of the weirdness of 64-bi

If this is intended for reading and writing by humans, then JSON doesn't cut it since you don't get comments (and perhaps also because of the weirdness of 64-bit floating-point values). Plus, XML is more "structurally nuanced". I suppose JSON is simpler to parse, but it's a trade-off of features, it's not like one is bad and the other is good.