Colors are sometimes ordered in reverse

[Krule]

Example:

irb(main):001:0> require 'color_sort';
irb(main):002:0* c1 = ["#0000ff", "#a52a2a", "#ffff00", "#808080", "#008000", "#ffa500", "#ffc0cb", "#ff0000", "#000000", "#ffffff"];
irb(main):003:0* c2 = ["#2b292e", "#0000ff", "#a52a2a", "#ffff00", "#808080", "#008000", "#ffa500", "#ffc0cb", "#ff0000", "#000000", "#ffffff"];
irb(main):004:0* ColorSort.sort(c1)
=> ["#0000ff", "#000000", "#a52a2a", "#ff0000", "#808080", "#008000", "#ffff00", "#ffa500", "#ffffff", "#ffc0cb"]
irb(main):005:0> ColorSort.sort(c2)
=> ["#ffc0cb", "#ffffff", "#ffa500", "#ffff00", "#008000", "#808080", "#ff0000", "#a52a2a", "#2b292e", "#000000", "#0000ff"]
irb(main):006:0> c2 - c1
=> ["#2b292e"]

As it can be seen, there is a single color difference between two array, but colors are sorted in different order.