C++ name mangling and vendor specific types

I’m reading http://mentorembedded.github.io/cxx-abi/abi.html#mangling on how to mangle C++ names. I believe that’s the base for Gnu/Linux and thus how Clang handles it?

It describes vendor specific types being encoded with a starting v, a digit, and a type. It appears that vector types are being encoded by clang++ with this scheme or something similar, like v2_i. I have a situation where I’m defining my own vector types and care about how the names are being mangled. Is there any official documentation on how these names are generated? Or is the working specification in libcxxabi’s cxa_demangle?