Per the API doc, PackageResults should not be an array when there is only one item:
https://github.com/UPS-API/api-documentation/blob/308f77eaccaf0cfbf92dc371bdcc9ff7102661a8/Shipping.yaml#L9805-L981…
Welcome back sports fans, we have another exciting round of Mac errors which make no sense.
This time in the blue corner we have test_pseudodata which can throw the following error on travis:
``…