Revision history for Data-Fenwick-Shared

0.03      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.

0.02      2026-07-22
          - Fix a use-after-free in merge(): sv_isobject on the peer argument
            runs get-magic, so a tied argument can destroy this object before
            its handle is used again. Such a call now croaks.
          - Add range-update mode (new_range / range_add; O(log n) range queries).
          - Resolve argument magic before capturing the path string.
          - Correct the POD: 0.02 cannot open a 0.01 file.

0.01      2026-07-10
          - Initial release. Shared-memory Fenwick tree (binary indexed tree):
            O(log n) point update and prefix-sum query over n signed int64
            positions, plus range/point/total, set, and a find (binary-lifting
            rank / weighted-sample lookup). Backed by a file, anonymous mapping,
            or memfd; write-preferring rwlock with dead-process recovery;
            element-wise merge. Linux, 64-bit Perl.