NumericStepper steps incorrectly with decimal values

Steps to reproduce:
1. Run the attached Main.mxml
2. "Step up" using up arrow the NumericStepper which is first one (fourth from the bottom)

Actual Results:
When you "step up" once, it is 1e-7
When you "step up" twice, it is NaN

Expected Results:
It should be 0.0000001 ->0.0000002 ->0.0000003
You can compare with the the NumericStepper which is second from the top (third from the bottom)

Workaround (if any):