I'm trying to use Vectors to represent a vector of user preferences. All is well since items are numeric and can be used as indexes into a Vector -- almost. I have longs, and of course indexes are ints.
I could fold the long IDs into ints without too much worry about the effects of collision. However I still need to remember the original item IDs for each index. I could do it with labels, but I can't retrieve the label for an index (and the other mapping isn't serialized anyway?). So I guess I must separately store this mapping? Just making sure I'm not missing something.
