###
@requires
    
    color

    colorbrewer
    w3cx11

    bezier
    cubehelix
    random
    average

    rgb hex hsl hsv num
    css named
    lch lab
    cmyk
    gl
    luminance
    temperature
    contrast

    get set

    darken saturate premultiply blend    

    scale
    limits
    
    interpolate-hsx
    interpolate-rgb
    interpolate-num
    interpolate-lab
###