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<?php $a = new ArrayObject(array(), ArrayObject::STD_PROP_LIST); $a[0]=0; $a['0']=1; var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
object(ArrayObject)#1 (1) { ["storage":"ArrayObject":private]=> array(1) { [0]=> int(1) } }

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