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9.4.0: New features, bug fixes and deprecations

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•Last updated May 3, 2026
  • comb through the existing tests, make them more fine-grained, clean them up and divide them into unit tests (which test only one class at a time) and functional tests (which test the whole system)
  • add more basic unit tests so we have at least the basic functionality covered
  • announce on social media that we are looking for more contributors (and possibly co-maintainers, if the collaboration is constantly good)
  • automate the Doxygen-generated documentation
  • go through the open PRs one by one, from old to new, decide if we want to have it at all, and re-create it with good test coverage (and then merge it)
  • go through the open tickets and categorize or close them
  • fix the bugs reported in the tickets
  • drop or enforce usage of mb_* methods
  • add logging
  • drop the switch for the lenient mode and instead use the behavior that matches what browsers do
  • raise the PHPStan levels one by one and fix all warnings
  • add extra-strict PHPStan rules and fix all warnings
  • set up mutation testing using Infection, go through the findings, and add test for the most important missed things
  • add a PHPStan extension for cognitive complexity and refactor the code to be easier to grok
  • make the types less ambiguous and more strict
  • find and fix the worst performance bottlenecks
  • every now and then test the latest development version with Emogrifier
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