Default the Add credit card Expiration month to 1
Putative bug: The Expiration month on the add payment form defaults to the current month.
Expected behaviour: The month should default to 1, as is the case with 99.31416% of other sites' forms. It is odd to have to consider what the current month is and so which direction to arrow up or down to, especially since the current month is not visibly related to likely expiration month.
Good call! We shall fix this!