* Support for PHP 7 is dropped
* Minimum supported version is PHP 8.1 (currently still actively supported by the PHP team)
* The lib now behaves closer to the RFCs, fixing some 20-year-old issues
* A new option is available to enforce a strict subset of characters as per RFCs (useStd3AsciiRules)
* Some newer PHP language features are used, replacing older constructs
* Much refactoring has happened to have cleaner code overall
* Many more test cases were added to the integration tests, guarding the changes made
* Please consult UPGRADING.md for details about backwards incompatible changes
Co-authored-by: Elan Ruusamäe <glen@pld-linux.org>