Rationale:

The absence of the typedef is irrelevant. Users can still access the typedef, because it is inherited from the base class.

Proposed resolution:

For consistency with the numpunct facet, add a typedef for char_type to the definition of the moneypunct_byname facet in [locale.moneypunct.byname].

The definition of the moneypunct facet contains the typedefs char_type and string_type. Only one of these names, string_type, is defined in the derived facet, moneypunct_byname.