natSor IgnoringLeadingSpaces
  ignore leading spaces: 2+0
   ignore leading spaces: 2+1
 ignore leading spaces: 2-1
ignore leading spaces: 2-2

   natSor IgnoringMultipleAdjacentSpaces
 ignore m.a.s   spaces: 2+0
 ignore m.a.s    spaces: 2+1
 ignore m.a.s  spaces: 2-1
 ignore m.a.s spaces: 2-2

   natSor EquivalentWhitespaceCharacters
 Equiv.
spaces: 3+1\ Equiv.�spaces: 3+0\ Equiv.	spaces: 3+2\ Equiv.�spaces: 3-1\ Equiv.
spaces: 3-2\ Equiv. spaces: 3-3\
   natSor CaseIndepenent
 casE INDEPENENT: 3+0
 case INDEPENENT: 3+1
 caSE INDEPENENT: 3-1
 cASE INDEPENENT: 3-2

   natSor NumericFieldsAsNumerics
 foo100bar10baz0.txt
 foo100bar99baz0.txt
 foo1000bar99baz9.txt
 foo1000bar99baz10.txt

   natSor Titles
 The 39 steps
 The 40th step more
 Wanda
 The Wind in the Willows