title: drop a series of true false in pandas removes first two lines
body: <p>Handing the pandas.drop function a list of <code>True</code> and <code>False</code> statements drops the first two lines. Why? Is this a bug?</p>
  
  <pre><code>df = pd.DataFrame({"foo":[1,2,3]})
  df.drop([False, False, True])
     foo
  2    3
  </code></pre>
  
  <p>Also only giving it a list of <code>False</code> will just drop the first line.</p>
  
  <pre><code>df = pd.DataFrame({"foo":[1,2,3]})
  df.drop([False, False, False])
     foo
  1    2
  2    3
  </code></pre>