code: public <T> Descriptor withPathParamSerializer(Class<T> pathParamType, PathParamSerializer<T> pathParamSerializer) {
          return withPathParamSerializer((Type) pathParamType, pathParamSerializer);
      }
docs: Provide a custom path param serializer for the given path param type.
  
  @param pathParamType The path param type.
  @param pathParamSerializer The path param serializer.
  @return A copy of this descriptor.