Something went wrong and the message was submitted before I was 
finished, so here the rest:

The test script I wrote is:
class Numeric
        def cm
                self*2.54
        end
end
puts "4.cm = #{4.cm}"
module Test
        class Numeric

                def cm
                        self*0.1
                end
        end
end

class Tc
        include Test
        def initialize
                puts "4.cm => #{4.cm}"
        end
end
t = Tc.new
puts "4.cm = #{4.cm}"
this results in:
4.cm = 10.16
4.cm => 10.16
4.cm = 10.16

Replacing class Numeric with class Object::Numeric will result in:
4.cm = 10.16
4.cm => 0.4
4.cm = 0.4

while the actual result that I aim for is:
4.cm = 10.16
4.cm => 0.4
4.cm = 10.16

Does anyone knows the answer to this one? Or an even better approach?

Many thanks,

Benjamin
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