type casted $qty to float in \Magento\Catalog\Model\Product::setQty()

Author: jayankaghosh

app/code/Magento/Catalog/Model/Product.php

@@ -958,7 +958,7 @@ public function afterSave()
     public function setQty($qty)
     {
         if ($this->getData('qty') != $qty) {
-            $this->setData('qty', $qty);
+            $this->setData('qty', (float)$qty);
             $this->reloadPriceInfo();
         }
         return $this;