Expected behaviour
I would like to be able to deliver pie.innerSize as a constant thickness of the ring (donut), regardless of the pie current size. I would like to supply a negative value which would then be calculated by the chart during render: innerSize: -8 // would keep the ring 8 pixels thick.
I also think, with negative value supplied, the animation should not animate the innerSize, but the ring should draw clock or counterclockwise.