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<?php $arrayOb = new \ArrayIterator([4 => null]); var_dump(array_key_exists(4, $arrayOb));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, ArrayIterator given in /in/eghui:5 Stack trace: #0 {main} thrown in /in/eghui on line 5
Process exited with code 255.

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