Back-fitting becomes a non-issue if we agree that references to ranges in other lists are references to the entire, virtual expanded list.
Checkins become simple if a given list only contains a taxon id once. Conceptually, replace every taxon in the old list with the single taxon in the new list, then collapse ranges (this won’t preserve placement structure)
A list only uses ranges from the list it is replaced-by. So you do need to do a tree walk to reconstruct an old list. But this is ok.
A checkout involves copying an entire list. Need to make this work with fragments.
Whenever a list item is a taxon rather than a reference to some other list fragment, then that’s what gets assigned a persistent id.


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