Well now I went and made a simple example and it didn't do it...huh. It looks like this is related to my approach of basically rendering to my target low resolution, then scaling that image up to the full screen resolution. It appears the interpolation is actually happening in the scaling up, which makes sense because a single pixel at my low resolution becomes multiple pixels when scaled up, so the fractional pixels will become whole pixels at this size. False alarm it appears; I borked it myself. :) I'm going to keep the integer casting because that actually corrects for my approach, but it's not always correct.
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