data attr case

HTML

<div id="test" data-TFO='{"a": 123}'></div>

JavaScript

var n = "test";
var v = "lol";

$Root = $("#" + n); 

console.log("1 data = %o", $Root.data("TFO"));
console.log("2 data = %o", $Root.data("tfo"));

$Root.data("tfo", $.extend({ k: v }, $Root.data("tfo")));
console.log("data = %o", $Root.data("tfo"));