From: Intransition <transfire@...>
Date: 2010-09-01T18:03:53+09:00
Subject: Array#=== as set equality

It looks like Array#== and Array#=== are the same. Is that correct?
That being so, would there be any serious consequences if Array#===
were redefined to mean "set equality", e.g.

  [:a,:b] === [:b,:a]    #=> true

I can think of a few times that would have been nice to have,
especially when testing and hashes come into play, the results often
do not have a fixed order. e.g.

  h = {:a=>1, :b=>2}
  r = h.map{ |k,v| [k,v] }

  assert  r == [[:a,1], [:b,2]]

won't work b/c it might also return

  [[:b,2], [:a,1]]