Only 1 is_a
function the_widget($widget, $instance = array(), $args = array()) {
.....
// if ( !is_a($widget_obj, 'WP_Widget') )
$class_name = 'WP_Widget';
if ( ( get_class($widget_obj) != $class_name )
&& !is_subclass_of($widget_obj, $class_name) )
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