In IE8, Return/Enter Key Erroneously Opens Dialog on Page with 1 Button Widget

In IE8, Return/Enter Key Erroneously Opens Dialog on Page with 1 Button Widget

To test, load this page using IE8:


Then hit return or enter.

Question 1: Bug or feature?

Question 2: Is there a way to prevent this?

Question 3: Should I put it on the bug tracker?

FWIW, I also got the same weird behavior in an autocomplete widget that hadn't loaded any data yet. Click for focus, hit return, dialog opens. Dialog is of course binded to a button widget click event, just like the demo. Something weird is going on.