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bfcc144798
After the changes in #15201, our Windows CI started to fail. The problem is that lightningcss now needs to convert `oklch` colors into the `oklab` space to inline some `color-mix()` functions. The problem, though, is that this calculation seems to have rounding differences between macOS, Linux, and Windows. Since we still want to _define the default color space in `oklch`_ and _use lightningcss as a post-processor in our unit tests so we have a better coverage of the output_, this PR attempts to fix the issue by adding a custom vitest serializer. It will find usages of the `oklab()` function with arguments that have lots of decimal places (at least 6 decimal places). What it then does is simply cut off any excess decimal places to truncate the output to 5 places. E.g.: ```diff - oklab(62.7955% .224863 .125846 / .75); + oklab(62.7955% .22486 .12584 / .75); ``` ## Test Plan I updated the CI workflow file to make all three builds run in CI and observed that they are now all green again. <img width="609" alt="Screenshot 2024-11-27 at 14 54 52" src="https://github.com/user-attachments/assets/73fe6da5-30e3-4fd4-83ea-115b1f1602a6">