For reasons I don't yet understand, the expected value for lerpColor(0, 255, .5)
has changed from 0xFF7F7F7F to 0xFF808080. When running a sketch in Python mode,
the value is 0xFF7F7F7F. When running a UT, it's 0xFF808080. I hope to understand
the disparity, but for now, I'm just fixing the test.