Revision history for Data-RadixTree-Shared

0.04      2026-08-12
          - Recover a file left behind by an interrupted create instead of
            leaving the path unopenable.
          - Frozen read-only mode: freeze() seals a file-backed structure;
            new_readonly() maps it O_RDONLY and queries it lock-free.
          - Documentation and test-harness corrections.
          - unlink() reports a removal that failed; one already gone is not an
            error.

0.03      2026-07-23
          - On-disk format change (v1 -> v2): an existing 0.02 file is
            refused; recreate it.
          - Reset the node recycle list in clear(): a stale free list handed the
            same node out twice after a clear, silently losing keys while
            count still counted them.
          - Make the edge split crash-safe and recycle freed nodes.
          - Fail insert on node-pool exhaustion instead of corrupting NIL.
          - Fix the insert capacity pre-check: it must cover the copy-on-write
            split's 3 transient node allocations (mid + ch2 + leaf) and count
            recycled free-list nodes. At 2 free nodes a split ran out of nodes
            mid-way and insert silently reported the dropped key as updated.

0.02      2026-07-03
          - Security and robustness hardening; backing files now created mode
            0600 (pass a file-mode argument to new() for cross-user sharing).

0.01      2026-06-26
          - Initial release.