Proposed resolution:

Remove the comment from the text in 22.2.3.2 and from the proposed resolution of library issue 228.

The definition of the numpunct_byname template contains the following comment:

    namespace std {
        template <class charT>
        class numpunct_byname : public numpunct<charT> {
    // this class is specialized for char and wchar_t.
        ...

There is no documentation of the specializations and it seems conceivable that an implementation will not explicitly specialize the template at all, but simply provide the primary template.