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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The idea was that you most commonly want to do set-like operations on the list of keys.
In theory you could implement `keys` to return a set in constant time as well, but I don't know if it's implemented in Ruby to work that way
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If nothing else the returned set would have to be immutable, which is not trivial to do in Ruby without cloning the underlying map
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