Revision history for Data-Histogram-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      2026-07-22
          - Fix use-after-free in merge() and record_many(): a tied argument,
            a tied array, or overloaded elements run Perl that can destroy
            the histogram, after which the already-captured handle was still
            used. Such a call now croaks.
          - On-disk format change (v1 -> v2): an existing 0.02 file is
            refused; recreate it.
          - Fetch get-magic on optional arguments before testing them.

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).
          - record() now croaks on a value above highest_trackable_value
            (previously such a value was silently bucketed to the top).

0.01      2026-06-25
          - Initial release.
