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<?php $a = array_merge_recursive(['k1' => [1,2,3]], ['k1' => [1,2,3]]); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { ["k1"]=> array(6) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(1) [4]=> int(2) [5]=> int(3) } }

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