title: Factory Girl sequence fails under autospec
body: <p>I have this Factory:</p>
  
  <pre><code>Factory.define :email_address do |e|
    e.sequence(:address) { |n| "factory_#{n}@example.com" }
    e.validated true
  end
  </code></pre>
  
  <p>When I run my specs with <code>rake spec</code>, it works fine.</p>
  
  <p>When I run autospec, it fails right away, claiming that the email address is being used twice in two different objects (there is a validation which restricts this).</p>
  
  <p>Why is it behaving differently under autospec?</p>