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<?php $a = new ArrayObject(); $a->offsetSet('null', null); var_dump($a->offsetExists('null')); var_dump(array_key_exists('null', $a));
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, ArrayObject given in /in/tVBWZ:6 Stack trace: #0 {main} thrown in /in/tVBWZ on line 6
Process exited with code 255.

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