The third parameter to swis->Invoke is a an array of the parameters for the verb. In your original example, this array has one element (an integer), so you are passing one argument (an integer) to the verb. In your second example, this array has two elements (two integers), so you are passing two arguments (two integers) to the verb. The verb expects one argument (an array of integers), so neither of these works. Hope that makes it more clear.
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