API is ignoring option to use Account/List prices, always returning account prices

With the current dev version of this module + dev versions of commerce and commerce_shipping I'm always getting back Account rates, never list rates.

Reproducing is pretty easy, simply get a quote, then switch the setting in the fedex config from List to Account, or Account to List, whichever you didn't try the first time, and the result of another rate request will be exactly the same.

It looked pretty simple to me, when I looked at line 809 of FedEx.php, it appears that it's setting the RateRequestType, then overwriting it with a blank array.

809: ->addToRateRequestTypes($this->configuration['options']['rate_request_type'])
810: ->setRateRequestTypes();

But, even when I comment out line 810 and do a dump of the RateRequest object I see that the RateRequestTypes array is ["NONE"], which, according to the FedEx docs, means they will return Account rates

So, one more test, I manually insert "LIST" into the RateRequestTypes array on the RateRequest object:

->addToRateRequestTypes('LIST');

I confirm by a dump of the RateRequest object that the RequestedShipment->RateRequestTypes is ["LIST"], but my response still doesn't change, and when I dump the RateReply object, I see that the ActualRateType is "PAYOR_ACCOUNT_PACKAGE". I believe based upon a fair amount of searching that I want "PAYOR_LIST_PACKAGE" there.

My two attached screenshots below show a dump of the request and response, showing the RateRequestTypes and ActualRateType as outlined above. I'm not sure what else I can share to make this easier.

At this point I'm out of ideas. It appears to me that the RateRequest object should be returning LIST prices but it's just not. I'm not sure if there's any way to dump the raw XML to inspect it, or if I'm way off base already and someone believes I'm barking up the wrong tree.

Edit: Fixed malformed code examples