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<?php $idx = (object) [ 'k' => [[3], [2,4]] ]; $idx->k[0] = [2]; print_r($idx);
Output for git.master, git.master_jit, rfc.property-hooks
stdClass Object ( [k] => Array ( [0] => Array ( [0] => 2 ) [1] => Array ( [0] => 2 [1] => 4 ) ) )

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