workaround #100728: can have received the wrong overload; the trick is to ask for the return value type name of the actual returned overload, rather than the one we think we have


git-svn-id: https://root.cern.ch/svn/root/trunk@48806 27541ba8-7e3a-0410-8455-c3a389f83636
protection for those cases where vector::at is still missing (like e.g. in std::vector<int> for some reason)


git-svn-id: https://root.cern.ch/svn/root/trunk@48807 27541ba8-7e3a-0410-8455-c3a389f83636