message: sanitize scale.color input to domain
diff: @@ -31,7 +31,7 @@ export namespace ColorScale {
  const diff = (max - min) || 1
  function color(value: number) {
  - const t = ((value - min) / diff) * count1
  + const t = Math.min(colors.length - 1, Math.max(0, ((value - min) / diff) * count1))
  const tf = Math.floor(t)
  const c1 = colors[tf]
  const c2 = colors[Math.ceil(t)]
  