title: Does the TeamCity build feature "Pull request" automatically run a merge build?
body: <p>Does the TeamCity build feature <code>Pull request</code> automatically build a pull request against master? I'm not talking about merging automatically into master just building against it.</p>
  
  <p>I can't seem to find any documentation. Previously in TC I could see two kinds of branches <code>33/merge</code> and <code>pull/33</code>, with the build feature enabled I can only see <code>pull/xx</code> being triggered. In the build summary it does state <code>Submitted into refs/heads/master, from xxxx-pull-request by xxxxxx</code></p>
  
  <p>So I can only assume it is running the pull request against <code>master</code> based on the text above, however I can't seem to find any documentation to indicate this.</p>