MAGETWO-50549: Create Hydrator that allows convert data interface to array and array to data interface

Fixing tests and annotation

Author: Igor Melnikov

app/code/Magento/ConfigurableProduct/Model/Product/Type/Configurable.php

@@ -534,11 +534,11 @@ public function getUsedProducts($product, $requiredAttributeIds = null)
 
             foreach ($collection as $item) {
                 /** @var \Magento\Catalog\Model\Product $item */
-                $this->getGalleryReadHandler()->execute('', $item);
+                $this->getGalleryReadHandler()->execute($item);
                 $usedProducts[] = $item;
             }
 
-            $product->setData($this->_usedProducts, $usedProducts);
+            $prodgiuct->setData($this->_usedProducts, $usedProducts);
         }
         \Magento\Framework\Profiler::stop('CONFIGURABLE:' . __METHOD__);
         return $product->getData($this->_usedProducts);

app/code/Magento/Paypal/Helper/Shortcut/CheckoutValidator.php

@@ -54,7 +54,7 @@ public function validate($code, $isInCatalog)
     }
 
     /**
-     * Сhecks payment method and quote availability
+     * Checks payment method and quote availability
      *
      * @param string $paymentCode
      * @param bool $isInCatalog

app/code/Magento/Paypal/Helper/Shortcut/Validator.php

@@ -111,7 +111,7 @@ public function isPriceOrSetAvailable($isInCatalog)
     }
 
     /**
-     * Сhecks payment method and quote availability
+     * Checks payment method and quote availability
      *
      * @param string $paymentCode
      * @return bool