Options are modified

[gastonfournier]

When you pass a null value to the cookie the expires value of options is modified and options should be readonly (at least I assume that). We had problems with such a case because we used a global object for options. It only happened on IE browsers.
Maybe the solution is to clone the options object into a local variable.

[carhartl]

The object is already cloned:

options = jQuery.extend({}, options);

In some outdated version this was an issue...