[mixedCase]

Because there's no point in saving three characters (although I'd rather have it be "literal_json" or "inline_json") just to have people memorize what yet another symbol means in a highly specialized context when you could just read the word and be perfectly certain what the code means without looking it up the first time.

Even after the first time symbols have a non-trivial cognitive cost for a lot of people, if not most, all while providing near zero benefit unless your app is pretty much nothing but a bunch of inline json expansions.