From: Ryan Davis <ryand-ruby@...>
Date: 2006-11-02T05:31:52+09:00
Subject: Re: Question about the Set class, XOR, and arrays


On Nov 1, 2006, at 12:25 PM, Daniel Berger wrote:

> irb(main):002:0> Set[1,2,3] ^ Set[3,4,5,5]
> => #<Set: {5, 1, 2, 4}>
>
> Ok, looks good.
>
> irb(main):003:0> Set[1,2,3] ^ [3,4,5,5]
> => #<Set: {1, 2, 4}>
>
> What?! I'm confused. Do I need a refresher in Set theory or something?

It is the way it is implemented... subsequent 5's will toggle it on  
and off. You should file a bug.