title: undefined method `to_a' for "ens160":String
body: <p>Ruby version - 2.0 gives this error</p>
  
  <pre><code> # Convert values to a pair of bytes ...
   interface = values[0]
   values.collect! { |i| i.to_a.pack('H*') }
  </code></pre>
  
  <p>with the same code, we never faced this sort of issue in ruby 1.8.7</p>