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$uri->query_form(foo => 1, foo => 2);
$uri->query_form(foo => [1, 2]);
$uri->query_form([ foo => 1, foo => 2 ]);
$uri->query_form([ foo => [1, 2] ]);
$uri->query_form({ foo => [1, 2] });

$ua->request(POST 'http://somewhere/foo', [
   editions    => [qw( D A H )],
   other_input => 'its value',
]);