class Kramdown::Element

def self.attrmangle(k)
  if (d = k.gsub(/_(.|$)/) { $1.upcase }) != k or d = STUDLY_ATTR_MAP[k]
    d
  end
end

def rfc2629_fix(opts)
  if a = attr
    if anchor = a.delete('id')
      a['anchor'] = ::Kramdown::Parser::RFC2629Kramdown.idref_cleanup(anchor)
    end
    if anchor = a.delete('href')
      a['target'] = ::Kramdown::Parser::RFC2629Kramdown.idref_cleanup(anchor)
    end
    if av = a.delete('noabbrev')      # pseudo attribute -> opts
      opts = opts.merge(noabbrev: TRUTHY[av]) # updated copy
    end
    attr.keys.each do |k|
      if d = self.class.attrmangle(k)
        a[d] = a.delete(k)
      end
    end
  end
  opts
end