Changelog

This page mirrors the repository root CHANGELOG.md.

[Unreleased]

[1.3.0] - 2026-02-19

Fixed

• Fix packed HLC decode for high-bit wall times.
• Enforce HLC drift bounds when the clock moves backwards.
• Harden VectorClock string parsing and coordinator locking.
• Fix VectorClock overflow behavior.
• Fix thread safety in demo FailureInjector.
• Preserve correlation IDs correctly in at-least-once demo flows.
• Prevent a template dictionary memory leak in the integration demo.
• Stabilize demo MessageId generation.

Changed

• Optimize HLC timestamp serialization/parsing, and simplify witness max selection.
• Make HLC message header TryParse non-exceptional.
• Split HLC coordinator supporting types into separate files.
• Optimize VectorClock merge/compare/increment and serialization.
• Use ArrayPool<T> for vector clock merge buffers.
• Use CollectionsMarshal for vector clock canonicalization.
• UUIDv7 packing now uses BinaryPrimitives and a tighter packing path.
• UUIDv7 factory batch generation throughput improvements.
• Adopt C# 14 extension member blocks.

Added

• Add high-value property tests for HLC and vector clocks.
• Demo: add distributed-systems at-least-once simulation with HLC/VC stats.

Documentation

• Update README with HLC and VectorClock wire formats.
• Clarify HLC drift bounds and ordering scope.

Build

• Infrastructure scripts: improve setup/maintenance harness and dotnet installation step.

[1.2.0] - 2026-01-27

Changed

• HLC receive semantics now witness the full remote HlcTimestamp (wallTime, counter, nodeId) (including nodeId tie-breaking) rather than only the remote wall time.
• HLC coordinator receive statistics now treat "remote ahead" based on full timestamp ordering.

Added

• Additional property tests for HlcCoordinator covering remote-ahead by counter, nodeId tie-breaking, remote-behind behavior, and mixed send/receive/time interleavings.
• Unit test coverage for receiving a remote timestamp with higher counter at the same wall time.

Build

• Centralized common build properties in Directory.Build.props.