Changes

     return Iterator.enemiesBy(context, n, function(e)

     return Iterator.enemiesBy(context, n, function(e)

         return e._hp -- skip unimplemented units

         return e._hp -- skip unimplemented units

         and (e:type() == type or type == 0)

         and (e:type() == type

            or type == 0

            or type < 0 and e:type() ~= type) -- skip SS-typed bosses

         and predInstallation(e)

         and predInstallation(e)

         and predBoss(e)

         and predBoss(e)