Spark NumericStepper doesnt play nice w/ decimals

Found in 4.0.0.9127

Steps to reproduce:
1. Compile and run attached MXML file.
2. Click the NumericStepper Stepper increment button to go from 0.0 to 1.0 in 0.01 increments (hold the button down).
3. Click the NumericStepper Stepper decrement button to go from 1.0 to 0.0 in 0.01 increments (hold the button down).

Actual Results:
Goes from 0.0 to 1.0.
Goes from 1.0 to 0.6 (but not 0.6 to 0.0).

Expected Results:
it should decrement from 1.0 to 0.0, not stop 40% way through. I couldnt repro with 0-100-0, so this seems semi-decimal specific.

Workaround (if any):