Storing to fields with data binding doesn't work

Pivot allows you to prefix a textKey attribute value with a "~" to indicate that that property should be accessed via the object's field. Currently, it doesn't work. When I try to do it, I get an IllegalArgumentException: Illegal identifier character.

I'm attaching a test case Eclipse project. Run FieldBug, put some stuff in the fields or not, and press "Store". You should see the exception. Set a breakpoint on the JSON.split method and rerun the app in the debugger. Step through and you'll see where the exception is being thrown.

Cheers.