+* Make `ProductsInfoController`'s `retrieveProductsInfo` thread safe ([#405]https://github.com/bizz84/SwiftyStoreKit/pull/495), related issues: [#344](https://github.com/bizz84/SwiftyStoreKit/issues/344) and [#468](https://github.com/bizz84/SwiftyStoreKit/issues/468)
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