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constraints => {
     image_name => [
...
     },
 
     ],

     foo => { constraint_method => 'bar', params => \@args },

     foo => { constraint => 'bar', params => [$dfv, @args]] },

     foo => { constraint => 'bar', params => [$dfv, 'foo', @args] },

bar($dfv, @args);
$dfv->bar(@args);