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<?php var_dump(array_unique(array_merge([ 'bootstrap', 'foo', 'boo' ], ['test', 'bootstrap', 'bar'])));
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { [0]=> string(9) "bootstrap" [1]=> string(3) "foo" [2]=> string(3) "boo" [3]=> string(4) "test" [5]=> string(3) "bar" }

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