title: Dapper materializing to a Tuple
body: <p>I need return a list from dapper with the new tuple in C# 7.</p>
  
  <pre><code>public static List&lt;(int StyleId, decimal StyleCode)&gt; GetOnlyServices()
  {
      var query = $@" SELECT
                      ST.style_id as StyleId, ST.style_code as StyleCode
                      ...
                      ...";
  
      using (SqlConnection db = new SqlConnection(InfobaseConString))
      {
          var a = db.Query&lt;(int StyleId, decimal StyleCode)&gt;(query, commandTimeout: 90).ToList();
          return a;
      }
  }
  </code></pre>
  
  <p>But this function only return me 56 rows with <code>(0,0), Item1=0, Item2=0</code>.
  What I missing?</p>