The code is unchecked for no particular reason. I'll look into it. Regarding the v1.2 spec, it might be worthwhile to support the older v1.1 as a config option in the event someone requires it.
Bill, I will take your advice and support SOAP 1.1 as well. Also will you have time to maintain this package in the future? If not I can volunteer to take on this responsibility as I will be working with this package for the duration of my phd, which is about another 2 more years.