Hue Satruation fade disabled inconsistent results

I just installed 1.9.11 and was testing Hue Saturation fades.  With H S fade disabled, I found that the Hue fade was not always a straight line between the end points.    The following examples are done with Saturation at 100 %.  For example, fading from Hue 0 degrees to Hue 180 degrees produces a straight line as observed on the color picker.  A fade from Hue 287 degrees to Hue 181 degrees also produces a straight line on  the color picker.  However a fade from Hue 0 degrees to Hue 108 degrees follows the curved path defined by the color picker circumference.  I expected a straight line like the other examples.

Is this a bug?  I have not ever done this test on any previous release.

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