veader/randumb — comment on commit b803ebefefa739d78d567839fbbcd2402ed3ef5c
File:  line 0
By veader:

Here is the benchmarking test code I used: https://gist.github.com/1959040
Here are the results: https://gist.github.com/1959092

Incrementally small "improvement" on fetching single item. Incrementally "worse" taking small-medium sized sub-set.
The rand() size of the resulting set may skew the results for the third test set but they seem to be fairly close.

Your call, of course, but it doesn't appear to do any real damage. "Real world" usage may dictate otherwise. :)