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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Sure! Would it be more expensive though?
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.
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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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