Checked state doesn't exist for Radios in IE?

Forgive me if this is already known, but I just noticed this while updating my code to remove aria-selected so that ARIA Radios will
always use aria-checked instead.

 

It looks like, even when aria-selected is not present, and aria-checked is used to set the checked state of a radio, the state in
the accessibility tree in IE is always "selected" and never "checked".

 

E.G

http://whatsock.com/tsg/Coding%20Arena/ARIA%20Radio%20Buttons/ARIA%20Radio%20Buttons/demo.htm

 

As a result, if you view this in JAWS using IE11, you hear the following for a checked radio button while arrowing down the page in
the virtual buffer:

 

"radio button not checked selected Gnarly!"

 

Every checked radio is conveyed as "not checked" it would appear as a result of this.

 

Is this already a known issue?

 

Thanks,

Bryan