Thought provoking idea of the day: A colleague suggested that Hash#keys should return a Set, instead of an Array in Ruby 
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A hash set is usually implemented as a thin wrapper around a hash map (this is true in Ruby specifically) so no it would not be.
Not sure what the benefit would be though since the values are already guaranteed to be unique.
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Yeah, I agree. I'm guessing that it's just the reinforcement of uniqueness?
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The idea was that you most commonly want to do set-like operations on the list of keys.
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