Property __cache from module Utils still retains DOM element from destroyed select2 instance.

Reproducible here: https://jsfiddle.net/wgnmvfbj/2/
Click on create then destroy, cache size will not go back to 0.

I've tracked down the issue to the following line adding to cache an item that is never removed:

I didn't find any reason for caching $container, so I assume the fix could be simply removing that line.