Combination of "startangle" and "arclength" is bugged for start angle above 180°

[t16h05008]

I wanted to modify the slider so that I get a full circle with the start position on top. The combination of "startangle" and "arclength" almost gave me this result. But as soon as I use start angles above 180°, the slider always stops on the left side.

This bug is reproducible by opening the demo page, going to the third slider under "Start Angle" and setting the arc length to more than 270 in the console. When you set the start angle to 180 or below it works as expected.