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#define CMP( callback, aa, bb ) \
( ( GvSV( a ) = ( aa ) ), ( GvSV( b ) = ( bb ) ), CmpAB( callback ) )
...
    Safefree( topN );
    Inline_Stack_Done;
}

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P:\test>topn -MAX=10000 -N=10
  1 trial  of     sort [10 of 10000] ( 17.186ms total), 17.186/trial
...
  1 trial  of topNbsAB [100 of 100000] (143.079ms total), 143.07/trial

  1 trial  of  topNbs@ [100 of 100000] (187.500ms total), 187.50/trial

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P:\test>topn -MAX=100000 -N=1000
[SNIP]
...
  1 trial  of topNbsAB [1000 of 100000] (298.991ms total), 298.99/tria
+l

  1 trial  of  topNbs@ [1000 of 100000] (296.875ms total), 296.87/tria
+l

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  1 trial  of     sort [10000 of 1000000] (   3.156s total), 3.156s/tr
+ial

  1 trial  of topNbsAB [10000 of 1000000] (  13.641s total), 13.641/tr
+ial

  1 trial  of  topNbs@ [10000 of 1000000] (   4.734s total), 4.734s/tr
+ial