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art_styles_write_the_same_bytes_again failed on Windows (MSVC) on the Pink swatch: the first save wrote its CMYK equivalent as 0 0.9317 0.1527 0 and the save of the reopened file as 0 0.9389 0.1629 0. The writer computes the CMYK equivalent of an RGB color from its RGB values, and the save of the reopened file computes it from the RGB values read back at four decimals; for this out-of-gamut color the Generic CMYK conversion moves by more than the test's 0.002 there. On macOS the two saves of this document differ by at most 0.0016 in these numbers. The test now blanks the CMYK equivalents of RGB colors (the first four numbers of `c m y k r g b Xa` and of an RGB gradient stop's `c m y k r g b 2 ... Bs`) and compares every other number, the RGB values included. With them blanked, the two saves are identical on macOS. The large-canvas test's comment also says what such objects are written as.