wtf.rb

class Foo < String
  attr_reader :omg
  def initialize(str, omg)
    super str
    @omg = omg
  end

  def hash
    [@omg, to_str].hash
  end

  def eql?(other)
    [@omg, to_str] == [other.omg, other.to_str]
  end

  def inspect
    "#<Foo:#{object_id} @omg: #{@omg} #{self.to_str}>"
  end
end

foo = Foo.new("holla", 1)
bar = Foo.new("holla", 2)
p foo, bar

x = {}
x[foo] = 1
x[bar] = 2

p x