Sure. NetSuite item fulfillment schema packages has this weird naming like package_list and package_ups_list for example. But they're pretty much the same thing. What it does is that it transforms the parameters so that we can merge all packages in one collection. (Besides UPS we probably need to handle others to have a single package collection, see https://system.netsuite.com/help/helpcenter/en_US/SchemaBrowser/transactions/v2013_2_0/sales.html#tranSales:ItemFulfillment for a list of possible package naming)

`package_tracking_number_ups` for example becomes `package_tracking_number` and so on. I'd add a doc block but added a spec so I guess it's kind of documented somehow.