While converting numeric values to pixel values, some bundle size can be saved if a blacklist is used, instead of a whitelist. Because when only numeric values are considered, unitless attributes are a lot less then props with units.
This is how emotion tackles the same conversion. It uses a package called @emotion/unitless, it was used as the main source in this PR. (source)
@emotion/unitless, it was used as the main source in this PR. (source)