the basic difference in approach was to switch the earlier approach of if (conditionA && conditionB && !conditionC) cache_it() to hey look, an item with feat

the basic difference in approach was to switch the earlier approach of if (conditionA && conditionB && !conditionC) cache_it() to hey look, an item with featureset X is cacheable while one with featureset Y is not. This reflects in the API which is just two calls predict() and feedback() this simplifies the integration code and is easily debuggable even in the face of changes.