When using names containg a "-" character in the data's name the removeData function does not work. Here some steps to reproduce:

var $b = $('body');

$b.data('x-y', 1);

console.log($b.data('x-y')); ok, this shows a 1

$b.removeData('x-y');

console.log( $b.data('x-y') ); not ok, this shows still a 1, should show undefined