its under developement althought it seems to stabilize as less and less things need to change
So this collection manager provides the layer between client code and a collection backend.
it defines the api a backend must satisfy.
How it's used... you need a working backend
the best backend currently is see tree/treebuf/
run the tests in tree/treebuf/* test.go
https://github.com/golang-collections/tree/tree/master/treebuf