title: Sorting a list of float with a nan
body: <p>Please explain !
  I can't even reproduce it on other computer.</p>
  <p><a href="https://i.stack.imgur.com/xFOti.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xFOti.png" alt="enter image description here" /></a></p>