[wp-hackers] seeking history on 2.1 feature proposal

[Steve Lewis]

My google-fu is failing me.  Can anyone please direct me to the feature
proposal for the new (to WP2.1) hierarchial link category system.

I am trying to find the proposal to justify it agains the changes in
behavior I am seeing for the template tags 'wp_link_cat' and 'link_cat' in
2.1 to decide if this is a 'bug,' or something else.

TIA
-- 
SteveL