Recurring event system sometimes suggests incorrect dates

I've been working with a new installation of 4.6.2 and trying out the recurring events feature. I've been very impressed with how robust it is given that this is a new feature, and I've used it to create over a thousand events on this one installation without any errors. Until I needed to set a simple event which repeated just three times on consecutive days to give four events overall. The first day was Dec 15, and I wanted it to repeat on the 16, 17 and 18.
I set the "repeats every" option to 1 day, and the "Ends" option to 'on Dec 18'. Save the settings and the pop-up lists the following suggested events:
15 Dec
16th Dec
17th Dec
18th Dec
19th Dec
I have repeated this on the demo site at http://d46.demo.civicrm.org (4.6.4) with the same results. If I change the "ends on" option to Dec 17 then the last suggested date changes to Dec 18.
I've used the "Ends on" date setting on many occasions when the "repeats every" option is set to '1 week' and have not seen this error on those occasions.
In addition, when setting "repeats every" to 1 day I found that if you set any dates to be excluded, these were ignored and the events were created for those dates anyway, even though the excluded dates were respected on the confirmation page,.