Qt animation with double values

Question

I'm animating the value transition in a gauge

CircularGauge {
    onValueChanged: {
        console.info('val' , value)
    }

    Behavior on value {
        RotationAnimation {
            duration: 20000
        }
    }
}

But the animation only happens in steps of 1. I did not find a way to make them do smaller steps.

Is there a way?