Documentation for reduce (specially rereduce) function is missleading

The documentation for reduce-functions is very missleading.

If you just read the first examples, you get the impression, that this function can be called by having a collection of reduced and non-reduced data.

I got informed via IRC by someone, working with CouchDB, that this isn't the case. You have either a collection of reduced or a collection of non-reduced data you get as arguments for this function.

The documentation there also talks about using the build-in function typeof ... I can hardly see that you've made use of that function ...