The problem with your suggestion is that two arrays with the same elements will give two entries in the hash (because they will have different references). Consider:
use strict;
use warnings;
use Data::Dumper;
my @foo = qw/1 2 3 4 5 6/;
my @fu = qw/1 2 3 4 5 6/;
my %bar = (
\@foo => 'elephants',
\@fu => 'zebras'
);
print Dumper \%bar;
Outputs something like:
$VAR1 = {
'ARRAY(0x18ae770)' => 'zebras',
'ARRAY(0x17f0ec8)' => 'elephants'
};
And:
my @foo = qw/1 2 3 4 5 6/;
my @fu = qw/1 2 3 4 5 6/;
my %bar = (
join ('',@foo) => 'elephants',
join ('',@fu) => 'zebras'
);
print Dumper \%bar;
Outputs:
$VAR1 = {
'123456' => 'zebras'
};
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