Why does this not work?

module StringRefinement
  refine String do
    def bar
      length
    end
  end
end

using StringRefinement
"abcdefghijklmnopqrstuvwxyz".send(:bar)
#NoMethodError: undefined method 'bar' for "abcdefghijklmnopqrstuvwxyz":String

Can someone explain why send doesn't work here? And is there a way to dynamically call methods defined in a refinement? I can't seem to find a good, full explanation of how refinements work in Ruby 2.0.

ruby ruby-2.0
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