The aatree project provides fully compatible alternatives to Clojure 
sorted-map, sorted-set and vector, with several extensions:
  - AAVector supports add/drop at any point using addn and dropn.
  - AAMap and AASet implement Reversible, Counted, Indexed and Sorted
  - CountedSequence implements Counted and do not use synchronized.
  - Lazy deserialization/reserialization provides ridiculously fast 
deserialize/update/reserialize processing typical of disk access.
  - Virtual Structures that can be larger than memory.

New in Release 0.6.0:

   - The Calf and Yearling databases have been reimplemented as composites 
   of bags of properties, with a minimal close function stack supporting a 
   simple component lifecycle.
   - The database content is now simply the uber map, with everything else 
   moved into atoms and volatiles in the options map, i.e. in the bag of 
   properties.
   - Updates are done via side-effects (update-assoc-in! and 
   update-dissoc-in! methods) within the context of a transaction to 
   facilitate a greater separation of concerns.

For more information on Calf and Yearling, see 
https://github.com/laforge49/aatree/wiki/ 
<https://github.com/laforge49/aatree/wiki/Transcription>Calf 
and https://github.com/laforge49/aatree/wiki/Yearling

https://github.com/laforge49/aatree#readme

On Clojars: https://clojars.org/aatree

Please feel free to comment on this project. Your participation would be 
most welcome.

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