WordPress doesn't honor array query vars

[Denis-de-Bernardy]

Since r4753, we're discarding arrays from the query vars. This makes the query_vars filter useless in the event one is hoping to let WP parse and retrieve array variables passed in e.g. a form related to a custom post type.

Was there any good reason to do this, or was it simply premature and overzealous sanitization?

[wonderboymusic]

Where is this not working?

add_filter( 'query_vars', function ( $vars ) {
	$vars[] = 'denis';
	return $vars;
} );

add_action( 'template_redirect', function () {
	var_dump( get_query_var( 'denis' ) );
	exit();
} );

Navigate to:
http://wordpress-core-develop/?denis[woo]=foo&denis[hoo]=bar

Result:

array(2) {
  ["woo"]=>
  string(3) "foo"
  ["hoo"]=>
  string(3) "bar"
}

pre_get_posts also works with arrays...

[Denis-de-Bernardy]

Replying to wonderboymusic:

Where is this not working?

add_action('template_redirect', function () {
    global $wp;
    var_dump($wp->query_string);
    die;
});

Can't recall which WP function I needed that relied on query_string, but that was the issue.

[chriscct7]

Can't replicate. No further reports in 2 years. Closing as worksforme. Reopen if someone can reproduce this