do_action will convert "single array object" as "object"

[erikdemarco]

/* Correct if $object is not object*/
$orders = array();
$orders[] = 'abc';

do_action( 'action123', $orders); 

add_action('action123', 'func123');
function func123($orders){
	//$orders will be array here (CORRECT)
}


/* BUG: if $orders is an object */
$orders = array();
$orders[]=new stdClass();
$orders->name='Order1';

do_action( 'action123', $orders); 

add_action('action123', 'func123');
function func123($orders){
	//$orders will be non-array here (BUG?)
}

Note:
This will run correctly if $orders[] is not object

[erikdemarco]

this bug has been there since 2 years ago

see contributed notes here:
​https://developer.wordpress.org/reference/functions/do_action/

[dlh]

#48382 was marked as a duplicate.

[JPry]

It appears that this behavior is intentional. This was put in place due to #48312 (as seen in change [46568]).