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<?php var_dump(['test' => 'hoho'] + ['stuff' => 'hihi']); var_dump(['test'] + ['stuff']);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["test"]=> string(4) "hoho" ["stuff"]=> string(4) "hihi" } array(1) { [0]=> string(4) "test" }

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