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module MyModule
def self.extend_object(obj)
puts "Hello from #{self}"
super # important
end
 
def self.hello
puts "Hello from #{self}"
end
end
 
pry(main)> (myextendedstring = "blah").extend(MyModule)
#=> Hello from MyModule
#=> "blah"
pry(main)> s.hello
#=> "Hello from blah"
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