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Adding class methods from a module, that are added to the class hierarchy (so you can use super, unlike with Module#extend)
module Foo
def find(*)
"Foo#find"
end
end
class Blah
class << self
include Foo
end
def self.find(*)
"Blah.find -- #{super}"
end
end
Blah.find #=> "Blah.find -- Foo#find"
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