[wp-hackers] Category Operation (Adjacency vs. Modified Preorder)

[Chris Johnson]

One thing I'm not sure about is if I should bother pre-sorting the table. 
Upon converting to the new indexing, should siblings be sorted by name and 
then during inserts and moves choosing appropriate insertion points. Again, 
this means more effort during inserts and updates but further simplifies 
reads by not requiring recursive processing to sort a tree after a query.