Datepicker 1.8.4 automatically selects day on all months ? Bug ?

Datepicker 1.8.4 automatically selects day on all months ? Bug ?

Hello.
I have found that datepicker from version 1.8.4 automatically selectes day on all months (when I select 5th of may then 5th day of month will be selected on all other months - visible on going to other months) - by selected I mean that ui-state-active class is added to element.
You can check this on demo (especially easilly visible on multiple month).
Version 1.8.1 was not doing this. Is this a feature or bug ? Is there any way of turning it off, I mean to select just one day ?