Question about the Set class, XOR, and arrays

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Hi all,

Ruby 1.8.5

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?

Thanks,

Dan