When store something with

$.data(element, "key-with-hypen", true);

you cannot get it, with the

$(element).data("keyWithHyphen", true);

The behaviour is new in the version 2.0, while version 1.11.3 get the stored data correctly

=> test case in version 1.11.3

http://jsbin.com/rulejupufu/1/edit?html,js,output

=> test case in version 2.1.4

http://jsbin.com/jawupunedu/1/edit?html,js,output