$.subclass has no root functions

[danheberden]

While a subclassed item has it's own copy of $.fn, root functions such as $.each aren't copied.

This explains it best: ​http://jsfiddle.net/danheberden/RhwE4/

A quick summary:

var $sub = $.subclass();
typeof $.each; // "function"
typeof $sub.each // "undefined"

[jitter]

Also check the related #7979

[danheberden]

Duplicate of #7979.