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  $shift->caption($args->{'caption'});
  $shift->starts($args->{'starts'});
...
  $shift->saturday($args->{'saturday'});
  $shift->sunday($args->{'sunday'});
  $shift->holiday($args->{'holiday'});

$shift->$_( $args->{$_} ) foreach qw(
 caption
...
 sunday
 holiday
);