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2d.imageData.object.wrap.html expects modulo 256, however Uint8ClampedArray (which is the data type for the ImageData pixel array) is now using clamping to 0 and 255.
Created attachment 1175 [details] Fixing expectations, renaming to clamp.
Created attachment 1176 [details] Fixing expectations, renaming to clamp. Cleaner diff.
https://w3c-test.org/html/tests/approved/canvas/2d.imageData.object.clamp.html
Okay, thanks, so this overlapped with: http://dvcs.w3.org/hg/html/rev/2aea5b0c16f8