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<?php $arr = array(); $arr[PHP_INT_MAX] = null; $arr[] = null; var_dump($arr);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Cannot add element to the array as the next element is already occupied in /in/Nm4GZ:4 Stack trace: #0 {main} thrown in /in/Nm4GZ on line 4
Process exited with code 255.

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