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#       This implements the logical recursion that we use to 
#       cheat the order find() imposes;

    `preprocess'
       The value should be a code reference. This code reference is us
+ed to
...
       strings and is expected to return a list of strings. The code c
+an be
       used to sort the strings alphabetically, numerically, or to fil
+ter
       out directory entries based on their name alone.

  ... preprocess => sub { sort { -d $a <=> -d $b } @_ }, ...