Better monks than I,

So, I've got this input file name in $ARGV[0], and then three-tuples follow that, composed of an output file, and two csv lists of numbers (I call them maps) : 
/bin/perl test.pl input out1 0,2,4,6 0,1,2,3 out2 1,3,5,7 0,1,2,3

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Okay, so here is a test loop to populate an array of hashes, each hash containing some useful stuff about each three-tuple. 
for ($ii=1;$ii<=@ARGV-1;$ii+=3)  # three-tuples (outfile, map1, map2)
{
  $files[(($ii-1)/3)]{fname}=$ARGV[$ii];
  $files[(($ii-1)/3)]{fhandle}= new IO::File ">".$files[(($ii-1)/3)]{f
+name};
  $files[(($ii-1)/3)]{map1}=[split /,/,$ARGV[$ii+1]];
  print "map1 : [" . join /,/,$files[(($ii-1)/3)]{map1} . "]\n";
  print Dumper(@files);
}

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Well, the wierd thing is that the second to last print statement prints something like: 
map1 : [ARRAY(0x1dc518c)]
$VAR1 = {
          'fname' => 'out1',
          'map1' => [
                     '0',
                     '2',
                     '4',
                     '6'
                   ],
          'fhandle' => bless( \*Symbol::GEN0, 'IO::File' ),
        };
.
.
.

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... instead of: 
map : [0,2,4,6]
.
.
.

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I've tried adding various brackets and parens (admittedly, not the best way to debug) to try to ensure proper context, but to no avail.
Yes, I know that I could simply print $ARGV[$ii+1] but that really wasn't the point. Ignoring stylistic and readability concerns (those will be woven into working code, not this cruft) what's wrong with the code?

In reply to Join returning array reference, not string... why? by mr. jaggers

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