Extend persistent path copying map with size tracking - #51
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Extend size tracking of PathCopyingPersistentTreeMap.java by reducing runtime complexity of size() from O(n) to O(1).
Extend PathCopyingPersistentTreeMapTest.java to verify correct size tracking across all versions to ensure full persistence.
The benchmark results can be found here:
results.integration-nightly-value.table.html