title: Cannot convert value of type 'Array[String]' to expected argument type 'Set<String>'
body: <p>In Swift, I have a function that I am passing an array to, and then using that array in another function.  I keep getting this error:</p>
  
  <blockquote>
    <p>Cannot convert value of type 'Array[String]' to expected argument type 'Set&lt;String&gt;'</p>
  </blockquote>
  
  <pre><code>@objc func getProductInfo(productIDs: Array&lt;String&gt;) -&gt; Void {
      print(productIDs) //this works with correct data
  
      SwiftyStoreKit.retrieveProductsInfo(productIDs) { result in
  
      ...
  </code></pre>
  
  <p>The rest works, and is tested when I pass in a regular array of <code>["Monthly", "Yearly", "etc..."]</code>.</p>