In http://developer.garmin.com/connect-iq/programmers-guide/resource-compiler/#settings there is:
[TABLE="class: grid, width: 500"]
[TR]
[TD]Attribute[/TD]
[TD]Value[/TD]
[TD]Notes[/TD]
[/TR]
[TR]
[TD]value[/TD]
[TD]The value to save if this item is selected by the user.[/TD]
[TD]The type of the value should match the property it’s being saved to. If it doesn’t match a compile time error is thrown.[/TD]
[/TR]
[/TABLE]
It would be nice if Notes or Value would say that the value can only be a number (integer) at the moment.
Yes, looking in the table before it, it says list can only be number property, but that might not meet the eye.