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my $in = [ one => 1, two => 2, two => '2.003' ];
my $out = {};
...
for(my $i=0; $i<$#$in; $i+=2) {
  push @{$out->{$in->[$i]}}, $in->[$i+1];
}

my $i=0;
push(@{$out->{$in->[$i++]}},$in->[$i++]) while $i<$#$in;