Number sort returns incorrect sort order

NumberSort sometimes returns an incorrect sort order.  For example:

```
NumberSort ( Substitute ( "44 99 100" ; " " ; ¶ ) )

Actual Result:
100
44
99

Expected Result:
44
99
100
```

Note that `NumberSort ( NumberSort ( Substitute ( "44 99 100" ; " " ; ¶ ) ) )` does give the correct result.
