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<?php $map = new WeakMap; $obj = new stdClass; $map[$obj] = 42; var_dump($map);
Output for git.master, git.master_jit, rfc.property-hooks
object(WeakMap)#1 (1) { [0]=> array(2) { ["key"]=> object(stdClass)#2 (0) { } ["value"]=> int(42) } }

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