Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

5 new transliteration schemes:
- Serbian (:serbian) translating Vuk's Cyrillic to Gaj's Latin (Lj, Nj, Dž, Đ, Ć).
- GOST 7.79-2000 System B (:gost779b) with standard ASCII digraphs.
- BGN/PCGN 1947 geographic romanization (:bgn_pcgn).
- Bulgarian official Streamlined System (:bulgarian).
- Belarusian national / UN 2012 Łacinka (:belarusian).
Reverse transliteration (detransliteration) via Cyrillic.detransliterate (and aliases .det, .reverse_transliterate) with reverse mapping tables and longest-token-first greedy matching.
CLI flag -r, --reverse for reversing transliterated text back to Cyrillic.
Comprehensive fixture datasets in test/fixtures/ and automated test suite in test/fixtures_test.rb verifying Ukrainian, Serbian, Bulgarian, Belarusian, Mongolian, and standard international schemes.
Comprehensive performance benchmark suite in benchmark/run.rb with rake benchmark task testing all schemes, detransliteration, and text scale using benchmark-ips.
Automated YARD documentation generation and deployment to GitHub Pages via .github/workflows/docs.yml and rake yard task.
Documentation link badge in README.md and documentation_uri gem metadata.
CLI executable support and unit test coverage for all new schemes and detransliteration.

CLI executable exe/cyrillic supporting direct arguments, files, piped STDIN, and scheme flag (-s).
Integration tests for CLI arguments, flags, files, and STDIN input.
GitHub Actions CI workflow for modern Ruby versions (3.3, 3.4, head) on main branch.
Automated GitHub Actions release workflow for building and publishing gem on git tag push.
Dependabot configuration for automated Bundler and GitHub Actions dependency updates.
Precompiled and cached regular expressions for character tables for improved performance.
Case-insensitive scheme resolution (e.g. :iso9, "ISO9", :de, "UA_PASSPORT").
Informative ArgumentError when an unknown transliteration scheme is specified.
Standard gem metadata URIs (source_code_uri, changelog_uri, bug_tracker_uri, rubygems_mfa_required).
Comprehensive YARD documentation with examples for Cyrillic.transliterate and Cyrillic.t.
SimpleCov test coverage tracking achieving 100% line coverage.
Unit tests for edge cases (nil, empty strings, scheme normalization, error handling).

Namespaced scheme modules under Cyrillic (Cyrillic::Iso9, Cyrillic::Mongolian, Cyrillic::Ukrainian, Cyrillic::UaPassport, Cyrillic::De) with backwards-compatible top-level aliases.
Set minimum required Ruby version to >= 3.3.0 in gemspec.
Update development dependencies (rubocop, rake, rdoc, irb, minitest, simplecov).
Untrack Gemfile.lock and add to .gitignore following gem development best practices.
Add .gitattributes for consistent LF line endings and diff drivers.
Integrate RuboCop code style checks into default rake task.
Update copyright year to 2018-2026 in LICENSE.txt.

Eliminate mutable string literal warnings under Ruby 3.4+ in Ukrainian Passport transliteration.
Fix character mappings and duplicate key warnings in ISO 9 table (ӵ and ҿ).