title: Avoid object_id warning when using andand in Ruby 1.9?
body: <p>When I load andand in Ruby 1.9 I get the warning</p>
  
  <pre><code>andand.rb:111: warning: undefining 'object_id' may cause serious problem
  </code></pre>
  
  <p>Does anyone know a way, other than modifying andand to not remove object_id, to avoid this warning?</p>
  
  <p>Thanks!</p>