title: Minimum string as per String#CompareTo
body: <p>Ok, I'm sure that this must exist on here somewhere, but I can't seem to find it.</p>
  
  <p>Is there, and if there is what is, a minimum (non-null) <code>String</code> sequence according to <code>String#CompareTo</code>?</p>
  
  <p>I'm guessing <code>""</code> but I'm not entirely sure.</p>