Hey,

in LESS and SASS the darken nand lighten function increase by an absolute amount. Example here: https://github.com/less/less.js/blob/fb5280f16f124e5062634a22be2f3c99e650d0a4/lib/less/functions/color.js#L163

This is a bit confusing because in color.js e.g. `color('#000000').lighten(1)' is still black.

I am not sure though if it would be better to change the function or create a new one like lightenAbsolute.

Best,
Finn