What I expect:
When you tap the "Tap Here!" text, the DataRepeater should redraw to list "1", "2", and "3".
What actually happens:
When you tap the "Tap Here!" text, the DataRepeater stays as-is.
Apparently, if I remove the "id" property from the arrays I'm setting, everything is hunky-dory:
I suspect this is a bug.
If this is intended behavior, then it should be documented.
Windows 8 / Chrome 36