WIP Deduploads

Work in progress to deduplicate loads of adjustments via enforcing the same object graph walking on each adjustment access.
@dkubb The memory scope builds an AR API compatible `#eligible` accessor returning a "sub scope" via restricting the predicate of the original scope. Thats the whole point of this branch. It allows to speed things up and still deduplicating the various filters via a scope like interface.