gistfile1.rb

require 'mixico'

module Bytes
  def self.mixin
    Fixnum.send(:include, Bytes)
  end

  def self.mixout
    Fixnum.send(:disable_mixin, Bytes)
  end

  def megabyte
    1048576
  end
end

def with(mod)
  mod.mixin
  yield
  mod.mixout
end

with(Bytes) do
  puts 1.megabyte
end

1.megabyte