Is the following stub for filtering Access-Challenge attributes from sites-available/default for future use?

#       Auth-Type eap {
#               eap {
#                       handled = 1
#               }
#               if (handled && (Response-Packet-Type == Access-Challenge)) {
#                       attr_filter.access_challenge.post_auth
#                       handled  # override the "updated" code from attr_filter
#               }
#       }

Uncommenting the lines causes the server to fail to start because that instance of the attr_filter module isn't defined. However subsequent testing (and a quick dive into the code) show that attr_filter isn't supported in the authenticate section. Should this stub simply be ignored at this point or am I missing something?

Ben