CSS Color 4 has made a few parsing and serialization changes we should match: - lch/lab/oklch/oklab all now take percent or number for all the non-hue components (with some new normalization / scaling rules for the percents) - lch/lab/oklch/oklab all now serialize using the numeric form for all non-hue components. Since we now want to serialize using the numeric form, we can also use this opportunity to remove the extra multiplications and divisions by 100 for oklch/oklab that we had to keep lightness as a percent, and just always keep it in the numeric form.