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Sizes:
                \@set1:  112 bytes,  364 bytes total
    set_to_bits(@set1):   24 bytes,   24 bytes total
  set_to_string(@set1):   44 bytes,   44 bytes total

Performance:
                  Rate $jac->sim sim only jaccard_string jaccard_bits
$jac->sim      63480/s        --     -21%           -62%         -80%
sim only       79868/s       26%       --           -53%         -75%
jaccard_hash  168300/s      165%     111%             --         -47%
jaccard_bits  318317/s      401%     299%            89%           --

use 5.026;
use strict;
...
    'jaccard_bits' => sub { $r = jaccard_bits(\@set1, \@set2) },
    'jaccard_hash' => sub { $r = jaccard_hash(\@set1, \@set2) },
});