Why does the Info palette show different RGB values for opposing halves of the same pixel?

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ps example.png

 

if @ above image, cursor hovering on left side of pixel, , info palette correctly reflecting rgb values of 255,255,255. if move cursor right half of pixel, starts reading rgb values of adjacent pixel (251, 251, 251)

 

why? bug or feature?

what sample size in eyedropper tool set to?



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