• Made analyze() more verbose by default to aid finding the rule cycles.
• Added parse_nested() overload that accepts a position as first argument.
• Added some experimental and undocumented contrib features and their infrastructure.
• Improved CMake support for <filesystem> fallbacks and alternatives.
  • Re-enabled support for GCC 7.
  • Automatically link with libstdc++fs or libc++fs as needed.
  • Added automatic fallback from std::filesystem to std::experimental::filesystem.
  • Added manual fallback from std::filesystem to boost::filesystem.
  • Thank you Beman Dawes!
• Converted continuous integration infrastructure to GitHub Actions.