Apple Api verifyReceipt return last_receipt_info as object instead of array, some time

[nguyenphong1301]

I run the test for a lot of receipts in prod env and see that the field last_receipt_info is is both array and map. Some receipt apple return array, some else return object. I tested with the receipt the same app and the same subscription. I check on the documentation here https://developer.apple.com/documentation/appstorereceipts/responsebody and see they said that last_receipt_info is an array, but it is not sometimes.

How to cover this case.