Thread:Talk:Extension default namespaces/Notes

I'd be very hesitant using "non-absurd" numbers in extensions. Someone could easily be using the number 140 in their wiki configuration for an extra namespace. Using negative numbers or absurdly large numbers would be a better solution. Also, if namespace 140 = Deletion discussion:, does that mean 141 = Deletion discussion talk:? And if not, what is 141? Will it be reserved? The negative namespaces are negative because they don't have a talk counterpart, which is also something to consider when having extensions reserve numbers.