ACP2E-2927: [REST API]: Use Default value in store view does not stay checked after adding configurations for a configurable product

Author: pradeep1819

app/code/Magento/Catalog/Controller/Adminhtml/Product/Initialization/Helper.php

@@ -402,7 +402,7 @@ private function overwriteValue($optionId, $option, $overwriteOptions)
                         $option['is_delete_store_title'] = 1;
                     }
                 }
-                if (CustomOptions::FIELD_TITLE_NAME == $fieldName) {
+                if (CustomOptions::FIELD_TITLE_NAME === $fieldName) {
                     $option[CustomOptions::FIELD_IS_USE_DEFAULT] = $overwrite;
                 }
             }

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

@@ -254,13 +254,13 @@ protected function _saveValueTitles(AbstractModel $object)
                     }
                 } else {
                     // we should insert record into not default store only of if it does not exist in default store
-                    if (($storeId == Store::DEFAULT_STORE_ID && !$existInDefaultStore) ||
+                    if (((int)$storeId === Store::DEFAULT_STORE_ID && !$existInDefaultStore) ||
                         (
-                            $storeId != Store::DEFAULT_STORE_ID &&
+                            (int)$storeId !== Store::DEFAULT_STORE_ID &&
                             !$isDeleteStoreTitle &&
-                            ($object->getDefaultTitle() != null && $object->getTitle() !== $object->getDefaultTitle())
+                            ($object->getDefaultTitle() !== null && $object->getTitle() !== $object->getDefaultTitle())
                         ) ||
-                        ($object->getIsUseDefault() != null && !(int)$object->getIsUseDefault())
+                        ($object->getIsUseDefault() !== null && !(int)$object->getIsUseDefault())
                     ) {
                         $data = $this->_prepareDataForTable(
                             new \Magento\Framework\DataObject(

app/code/Magento/Catalog/Model/ResourceModel/Product/Option/Value.php

@@ -284,12 +284,12 @@ protected function _saveValueTitles(AbstractModel $object)
                         Store::DEFAULT_STORE_ID
                     );
                     // we should insert record into not default store only of if it does not exist in default store
-                    if (($storeId == Store::DEFAULT_STORE_ID && !$existInDefaultStore) ||
+                    if (((int)$storeId === Store::DEFAULT_STORE_ID && !$existInDefaultStore) ||
                         (
-                            $storeId != Store::DEFAULT_STORE_ID &&
-                            ($object->getDefaultTitle() != null && $object->getTitle() !== $object->getDefaultTitle())
+                            (int)$storeId !== Store::DEFAULT_STORE_ID &&
+                            ($object->getDefaultTitle() !== null && $object->getTitle() !== $object->getDefaultTitle())
                         ) ||
-                        ($object->getIsUseDefault() != null && !(int)$object->getIsUseDefault())
+                        ($object->getIsUseDefault() !== null && !(int)$object->getIsUseDefault())
                     ) {
                         $bind = [
                             'option_type_id' => (int)$object->getId(),