title: Return of Lua string.sub() with a negative range?
body: <p>In all the Lua definitions of <code>string.sub</code> I could not find what it returns when the second index is positive yet smaller than the first.</p>
  <p>E.g. <code>string.sub(someString, 3, 2)</code></p>
  <p>Will it always return the empty string &quot;&quot;?</p>