The recently added test case Play/AiksTest.CanRenderSkewedCircleHairline/Metal shows inconsistent rendering on the hairline stroke around the edges of the circle. You can see from the screenshot below that the thickness of the stroke is wider on the upper left and lower right and thinner to the point of almost dropping out along the long edges (upper right and lower left).

Output from CanRenderSkewedCircleHairline test on Metal