Proof of concept for ruby refinements

bad.rb

class Fixnum
  def dance
    puts "I'M THE BEST DANCER"
  end
end

refined.rb

require_relative 'refinements'
using EXT

1.dance # => "I'm dancing!"
say_hi # =>  "I'M THE BEST DANCER"

refinements.rb

module EXT
  refine Fixnum do
    def dance
      puts "I'm dancing!"
    end
  end
end

# If this line is uncommented, everything works as intended
# using EXT

def say_hi
  puts 1.dance
end

unrefined.rb

require_relative 'refinements'
require_relative 'bad'

puts 1.dance # =>  "I'M THE BEST DANCER"