of doubles in ascending order and returns an array of
 integers with the positions of the elements of the original array in the
 sorted array. NOTE THESE CHANGES: the sort is no longer stable and it
 doesn't use safe floating-point comparisons anymore. Occurrences of
 Double.NaN are treated as Double.MAX_VALUE.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>array</code> - this array is not changed by the method!</dd>
<dt><span class="strong">Returns:</span></dt><dd>an array of integers 