prefer Ranges over KeyedContainer

Gerhard Ravenrequested to merge
prefer_range_over_keyedcontainer into master

Using Range over KeyedContainer allows inputs to (also) be of type SharedObjectsContainer -- this makes the code more generic, and invariant under future updates which will use SharedObjectsContainer in a few instances where currently a KeyedContainer is used.

requires Rec!3586 (merged)

Edited by Gerhard Raven

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