Changes in version 1.0.0 (2026-06-11)                  

Bug Fixes

  - puny_decode() (and the URL/domain decoders) now bound label length
    in both strict and non-strict mode. A crafted oversized xn-- label
    previously drove the fallback decoder into quadratic time with
    unbounded allocation; oversized labels are now rejected promptly
    (error in strict mode, NA in non-strict).

New Features

  - Strict decoding now enforces RFC 5891 canonical A-label form: a
    decoded label must re-encode to itself. Non-canonical encodings
    (e.g. uppercase payloads) are rejected in strict mode while
    non-strict decoding stays lenient.

New Features

  - Initial release of punycoder package
  - Core punycode encoding and decoding functions (puny_encode(),
    puny_decode())
  - URL-aware processing functions (url_encode(), url_decode(),
    parse_url())
  - Domain validation and utility functions (is_punycode(), is_idn(),
    validate_domain())
  - Comprehensive test suite with RFC 3492 compliance testing
  - High-performance C++ backend with Rcpp
  - Vectorized operations for bulk processing
  - Robust error handling and validation
  - Complete documentation with vignettes

Package Structure

  - CRAN-compliant package structure
  - MIT license
  - Comprehensive test coverage
  - Performance optimizations
  - Cross-platform compatibility (Windows, macOS, Linux)

Technical Implementation

  - C++ backend using Rcpp for performance
  - Placeholder implementation ready for libidn2 integration
  - RFC 3492 compliance framework
  - Extensive input validation
  - Memory-efficient vectorized operations

Documentation

  - Complete function documentation with examples
  - Introductory vignette
  - README with quick start guide
  - Test vectors from RFC 3492 specification

Future Roadmap

  - Integration with GNU libidn2 for production punycode implementation
  - Performance optimizations
  - Additional URL manipulation utilities
  - Integration examples with popular R packages