domain([0, 1]).range([0, 1]):
         -0.5  ->  −0.250
          0.0  ->   0.000
          0.5  ->   0.250
          1.0  ->   1.000
          1.5  ->   2.250

domain([1, 2]).range([0, 1]):
          0.5  ->  −0.250
          1.0  ->   0.000
          1.5  ->   0.417
          2.0  ->   1.000
          2.5  ->   1.750

domain([01/01/1990, 01/01/1991]).range([0, 1]):
   10/20/1989  ->  −0.194
   01/01/1990  ->   0.000
   03/15/1990  ->   0.196
   05/27/1990  ->   0.394
   01/01/1991  ->   1.000
   03/15/1991  ->   1.206

domain([0, 1]).range(["red", "blue"]):
         -0.5  ->  rgb(319,0,-64)
          0.0  ->  rgb(255,0,0)
          0.5  ->  rgb(191,0,64)
          1.0  ->  rgb(0,0,255)
          1.5  ->  rgb(-319,0,574)

domain([0, 1]).range(["red", "blue"]).interpolate(hsl):
        -0.50  ->  #ff00ff
         0.00  ->  #ff0000
         0.50  ->  #ffff00
        √0.50  ->  #00ff00
         1.00  ->  #0000ff
         2.00  ->  #0000ff

ticks:
            1  ->  0, 1
            2  ->  0.0, 0.5, 1.0
            5  ->  0.0, 0.2, 0.4, 0.6, 0.8, 1.0
           10  ->  0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0

descending ticks:
            1  ->  0, 1
            2  ->  0.0, 0.5, 1.0
            5  ->  0.0, 0.2, 0.4, 0.6, 0.8, 1.0
           10  ->  0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0

domain clamping:
        under  ->  0
         over  ->  1

nice():
   [ 1.100, 10.900 ]    ->   1.000, 11.000
   [ 10.900, 1.100 ]    ->   11.000, 1.000
   [ 0.700, 11.001 ]    ->   0.000, 12.000
   [ 123.100, 6.700 ]   ->   130.000, 0.000
   [ 0.000, 0.490 ]     ->   0.000, 0.500
   [ 0.100, 1.000, 2.500, 3.000, 10.900 ] ->   0.000, 1.000, 2.500, 3.000, 11.000