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Plotting a Polar ColumnRange point where high and low are same value renders as if low is 0

If a polar series with drawType of RangeColumn has a point where the "high" and "low" values are identical it seems to render as if the low is 0 rather than rendering a column with no height.

I've modified one of your examples here to demonstrate. I've modified the points for Nov and Dec - the point for Nov has a small difference between its high and low values (10.2 and 10.1). The point for Dec has the same value for high and low (10.1) and as you can see on the resulting chart it plots as if the low for the range was 0.

Looking at the code in polar-series.js I can see that for some reason if startValue equals endValue it sets the radius to 0 (whilst innerRadius is still based off startValue) which seems to be the cause of the bug.

Note that a standard RangeColumn series behaves as expected - i.e. given the same data it would plot a column range with no height (so nothing would be visible for that column).