title: Python shapely: .equals function does not always work:
body: <p>I am having a few issues with the shapely library.
  Now the equals function seem not to always work:</p>
  
  <pre><code>poly1 =  Polygon(([220.0, 400, 500], [220.0, 20, 500], [220.0, 20, 0], [220.0, 400, 0], [220.0, 400, 500]))
  poly2 =  Polygon(([220.0, 20, 500], [220.0, 400, 500], [220.0, 400, 0], [220.0, 20, 0], [220.0, 20, 500]))
  
  print (poly1.equals(poly2))
  </code></pre>
  
  <p>Results with a false.
  Any idea  why?</p>