domain([0, 1]).range([0, 1]):
        -0.50  ->   NaN
         0.00  ->   0.000
         0.25  ->   0.500
         0.50  ->   0.707
         1.00  ->   1.000
         4.00  ->   2.000

domain([0, -1]).range([0, 1]):
         0.50  ->   NaN
         0.00  ->   0.000
        -0.25  ->   0.500
        -0.50  ->   0.707
        -1.00  ->   1.000
        -4.00  ->   2.000

domain([1, 2]).range([0, 1]):
          0.5  ->  −0.707
          1.0  ->   0.000
          1.5  ->   0.543
          2.0  ->   1.000
          2.5  ->   1.403

domain([0, 1]).range(["red", "blue"]):
         0.00  ->  rgb(255,0,0)
         0.25  ->  rgb(128,0,128)
         1.00  ->  rgb(0,0,255)
         4.00  ->  rgb(-255,0,510)

domain([1, 0]).range(["red", "blue"]).interpolate(hsl):
         0.00  ->  #0000ff
         0.25  ->  #00ff00
         0.50  ->  #d3ff00
         1.00  ->  #ff0000
         4.00  ->  #00ff00