title: use closure_tree to represent ordered list in Rails
body: <p>Would it be advisable to use the <a href="https://github.com/mceachen/closure_tree" rel="nofollow"><code>closure_tree</code></a> gem to represent an ordered list? e.g. this Rails model:</p>
  
  <pre><code>class OrderedSet &lt; ActiveRecord::Base
    acts_as_tree, order: 'position' #order is a supported option
  end
  </code></pre>
  
  <p>My thoughts:</p>
  
  <ul>
  <li>It might be convenient represent an ordered
  dictionary, since the gem can generate a hash tree.</li>
  <li>Maybe sometimes you just want a list of trees? Random example: a central strand of nerve cells in the arm with neurons that branch out along it</li>
  </ul>