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<?php $defaults = ['ui' => ['editable' => true]]; var_dump(array_merge_recursive([ 'ui' => ['editable' => false], ], $defaults));
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { ["ui"]=> array(1) { ["editable"]=> array(2) { [0]=> bool(false) [1]=> bool(true) } } }

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