duplicate key storing

[Skaperen]

i recall a module that did this, but i haven't gone to look for it, yet. i think it was called collection. i want to stored keyed data which could have multiple data objects under the same key. what i would normally do is just keep everything in a list, with all lists in a dictionary under the respective key, and append if the list is already there. that way i have every object that has that key and they are in the order stored (i don't need the ordering). right now i am wondering if my simple way is good enough or if i should go find that module.