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<?php var_dump(array_merge_recursive(array("text-decoration" => array("underline")), array("text-decoration" => array("overline"))));
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { ["text-decoration"]=> array(2) { [0]=> string(9) "underline" [1]=> string(8) "overline" } }

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