I had occasion to make a color interpolator that works with hex, rgb, rgba, and rgba with hex + alpha (rgba(#0078e7, 0.4))
it comes up to roughly 1k of minified code, and I think it would be pretty beneficial to css fns, as the code also supports getting luminance of the color, determining whether a color is light or dark, and lightening and darkening a color
any opinions on adding it to the cssfn PR?
aside from that, interpolators aren't automatically used, so any opinions on adding any registry interpolators to the heap that get tried by default?
there's also a bug wherein the interpolator option is ignored when passed to ractive.animate