From: Malte Milatz <malte__@...>
Date: 2005-12-10T03:37:35+09:00
Subject: Re: Build array of possible combinations

Timo Hoepfner:
>      assert_equal(true, set_of_sets.include?(contained_set))

Interesting:

irb> [ 'a', 'b' ].to_set.eql? [ 'a', 'b' ].to_set
     => false
irb> [ 'a', 'b' ].to_set == [ 'a', 'b' ].to_set
     => true

So Set#== and Set#eql? behave differently.

Malte