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<?php var_dump(array((object)array('0' => 'b')));
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(1) { [0]=> object(stdClass)#1 (1) { ["0"]=> string(1) "b" } }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
array(1) { [0]=> object(stdClass)#1 (1) { [0]=> string(1) "b" } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
array(1) { [0]=> object(stdClass)(1) { [0]=> string(1) "b" } }

preferences:
271.99 ms | 401 KiB | 456 Q