There are 2 functions with is_a in this file.
function wp_authenticate_username_password($user, $username, $password) {
function wp_authenticate_cookie($user, $username, $password) {
// if ( is_a($user, 'WP_User') ) { return $user; }
$class_name = 'WP_User';
if ( ( get_class($user) == $class_name )
|| is_subclass_of($user, $class_name) ) { return $user; }
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[...] wp-includes/user.php [...]